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🧪IB Chemistry

IB Chemistry Internal Assessment:

Diverse Topics and Detailed Explorations for IB Students

Welcome to our IB Chemistry Internal Assessment (IA) Resource Page! We have compiled a selection of engaging and diverse IA topics designed to spark your curiosity and guide your research. Each topic is carefully crafted to provide you with a clear focus for your investigation. Whether you're exploring the effect of temperature on reaction rates, the impact of pH on catalase activity, determining vitamin C content in fruit juices, or examining light intensity on photosynthesis in Elodea, most of these topics are suitable for both SL and HL students, with extensions for those seeking a deeper challenge. Dive into these exciting topics and start your scientific exploration with confidence! You can find the rubric and tips and tricks for science IA on another page.

SLStandard Level
HLHigher Level
SL/HLBoth Levels

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#1Recommended Level: SL/HL

Effect of Temperature on Reaction Rate of Sodium Thiosulfate and Hydrochloric Acid

Research Question

How does temperature affect the reaction rate between sodium thiosulfate and hydrochloric acid?

Rationale

Understanding reaction kinetics and the impact of temperature on reaction rates.

Background Information

Discusses reaction kinetics, collision theory, and the Arrhenius equation.

Variables

Independent: Temperature.

Dependent: Reaction rate.

Controlled: Concentration of reactants, volume of solutions, and ambient conditions.

Methodology

Conduct experiments at different temperatures and measure the reaction rates. One common method is mixing sodium thiosulfate and hydrochloric acid in a flask and placing them over a marked piece of paper. Observe the time it takes for the solution to turn cloudy and obscure the mark, indicating the reaction's completion. Alternatively, you can measure the decrease in light transmission through the solution using a light sensor (spectrophotometer) and data logger for more precise results. For a standard protocol on the 'disappearing cross' method, refer to the Royal Society of Chemistry's guidelines.

Data Analysis

Graph reaction rate versus temperature and apply the Arrhenius equation to determine activation energy.

Conclusion

Confirm the direct relationship between temperature and reaction rate.

Evaluation

Discuss experimental limitations and potential improvements.

Extension for HL

Determine the activation energy using the Arrhenius equation, explore different methods for determining reaction rates. Students can use PhET Interactive Simulations to visualize collision theory and activation energy.

#2Recommended Level: SL/HL

Impact of pH on Catalase Activity in Potato Extract

Research Question

How does pH affect the enzyme activity of catalase in potato extract?

Rationale

Exploring enzyme kinetics and the influence of pH on enzymatic activity.

Background Information

Discuss enzyme structure and function, factors affecting enzyme activity, and the role of pH.

Variables

Independent: pH levels.

Dependent: Enzyme activity.

Controlled: Temperature, concentration of substrate and enzyme, volume of solutions.

Methodology

Measure the rate of oxygen production at different pH levels using a gas syringe, use a larger sample size to improve data accuracy and statistical significance. A detailed reference for the 'gas syringe' setup can be found at Practical Biology (Nuffield Foundation).

Data Analysis

Graph enzyme activity versus pH, identify the optimal pH for catalase activity.

Conclusion

Determine the optimal pH and discuss deviations.

Evaluation

Address experimental limitations and suggest further research.

Extension for HL

Explore the enzyme kinetics by calculating Vmax and Km, investigate the effect of pH on enzyme structure.

#3Recommended Level: SL/HL

Determining the Vitamin C Content in Different Fruit Juices Using Iodometric Titration

Research Question

What is the vitamin C content in various fruit juices determined using iodometric titration?

Rationale

Evaluating the nutritional value of different fruit juices.

Background Information

Discuss the importance of vitamin C, iodometric titration principles, and the role of antioxidants.

Variables

Independent: Type of fruit juice.

Dependent: Vitamin C content.

Controlled: Volume of juice, titration technique, and indicator used.

Methodology

Perform iodometric titrations on different fruit juices, record volumes, and calculate vitamin C content. Explore the use of alternative methods, such as spectrophotometry, for comparison and validation. A detailed procedure for iodometric titration can be found in this laboratory manual from the University of Canterbury.

Data Analysis

Graph vitamin C content, compare between different juices.

Conclusion

Determine vitamin C content and evaluate nutritional claims.

Evaluation

Discuss experimental limitations and potential improvements.

Extension for HL

Compare the results using different methods like DCPIP titration, explore the stability of vitamin C under different storage conditions.

#4Recommended Level: SL/HL

Effect of Light Intensity on Photosynthesis Rate in Elodea

Research Question

How does light intensity affect the rate of photosynthesis in Elodea?

Rationale

Investigate the fundamental principles of photosynthesis and the role of light.

Background Information

Covers the process of photosynthesis, light-dependent reactions, and the importance of light intensity.

Variables

Independent: Light intensity.

Dependent: Rate of photosynthesis.

Controlled: Carbon dioxide concentration, temperature, and water availability.

Methodology

Measure oxygen production at different light intensities using a photosynthometer, ensure consistent lighting conditions. Measure other photosynthetic parameters (e.g., oxygen consumption) to provide a more comprehensive analysis. For reliable methods, see Science and Plants for Schools (SAPS).

Data Analysis

Graph rate of photosynthesis versus light intensity, identify the light saturation point.

Conclusion

Determine the optimal light intensity for photosynthesis in Elodea.

Evaluation

Address data accuracy, experimental setup, and suggest further research.

Extension for HL

Investigate the effect of different wavelengths of light, explore the relationship between light intensity and other photosynthetic parameters.

#5Recommended Level: SL/HL

Investigating the Boiling Point Elevation of Water with Different Salt Concentrations

Research Question

How does salt concentration affect the boiling point of water?

Rationale

Practical exploration of colligative properties and their real-world applications.

Background Information

Discuss boiling point elevation, colligative properties, and the impact of solute concentration.

Variables

Independent: Salt concentration.

Dependent: Boiling point of water.

Controlled: Volume of water, type of salt, and atmospheric pressure.

Methodology

Measure boiling points of water with varying salt concentrations using a laboratory thermometer, consider varying the type of salt to investigate the impact of ionic strength.

Data Analysis

Graph boiling point versus salt concentration, calculate the boiling point elevation constant.

Conclusion

Confirm the direct relationship between salt concentration and boiling point elevation.

Evaluation

Discuss experimental limitations and potential improvements.

Extension for HL

Calculate the boiling point elevation constant for each salt, explore the effect of different types of solutes on boiling point elevation.

#6Recommended Level: SL/HL

Effect of Surface Area on Reaction Rate Between Marble Chips and Hydrochloric Acid

Research Question

How does the surface area of marble chips affect the rate of reaction with hydrochloric acid?

Rationale

Fundamental exploration of surface area and reaction rate relationships.

Background Information

Discuss reaction kinetics, surface area impact, and collision theory.

Variables

Independent: Surface area of marble chips.

Dependent: Reaction rate.

Controlled: Concentration of hydrochloric acid, volume of solution, and ambient conditions.

Methodology

Measure carbon dioxide production at different surface areas using a gas syringe, explore different shapes and sizes of marble chips to assess the influence of surface geometry.

Data Analysis

Graph rate of reaction versus surface area, calculate the reaction rate constant.

Conclusion

Confirm the direct relationship between surface area and reaction rate.

Evaluation

Address data accuracy, experimental setup, and suggest further experiments.

Extension for HL

Analyze the surface area-to-volume ratio's impact on the reaction rate, investigate different shapes and sizes of marble chips.

#7Recommended Level: SL/HL

Determining the Concentration of an Unknown Acid Using Titration

Research Question

What is the concentration of an unknown acid solution determined through titration with a standard base?

Rationale

Practical application of acid-base titration techniques to determine unknown concentrations.

Background Information

Discuss acid-base reactions, titration principles, and indicator selection.

Variables

Independent: Volume of titrant.

Dependent: Endpoint determination.

Controlled: Concentration of standard base, volume of unknown acid, and titration technique.

Methodology

Conduct titrations, record volumes, and calculate the concentration of the unknown acid. Introduce a known acid solution for calibration and comparison.

Data Analysis

Utilize titration curves and stoichiometric calculations to determine concentration.

Conclusion

Provide the calculated concentration and discuss accuracy.

Evaluation

Identify sources of error and suggest improvements.

Extension for HL

Perform back titration for more accuracy and comparison, explore the use of different indicators and their effects on titration results. (To perform a back titration in this context, you would first add an excess known volume and concentration of a standard base to the unknown acid solution, allowing it to fully react. Then, you titrate the remaining unreacted base with a standard acid to determine the amount of base that did not react with the acid. This allows you to calculate the concentration of the unknown acid by subtracting the moles of base that reacted with the standard acid from the initial moles of base added, providing a more accurate measurement when direct titration is challenging.)

#8Recommended Level: SL/HL

Impact of Substrate Concentration on Enzyme Activity of Amylase

Research Question

How does substrate concentration affect the enzyme activity of amylase?

Rationale

Explore enzyme kinetics and amylase's role in breaking down starch.

Background Information

Discuss enzyme function, amylase activity, and Michaelis-Menten kinetics.

Variables

Independent: Substrate concentration.

Dependent: Enzyme activity.

Controlled: Temperature, pH, enzyme concentration.

Methodology

Measure starch breakdown at different substrate concentrations using iodine test. Use different substrates or an enzyme mix to investigate enzyme specificity and kinetics.

Data Analysis

Plot rate versus substrate concentration, fit data to Michaelis-Menten equation.

Conclusion

Determine kinetic parameters and optimal substrate concentration.

Evaluation

Address data accuracy, experimental setup, and suggest further experiments.

Extension for HL

Determine kinetic parameters (Vmax and Km), explore the effect of different substrates on enzyme activity.

#9Recommended Level: SL/HL

Effect of Temperature on the Solubility of Potassium Nitrate

Research Question

How does temperature affect the solubility of potassium nitrate?

Rationale

Practical exploration of solubility principles and temperature dependence.

Background Information

Discuss solubility, temperature impact, and saturation point.

Variables

Independent: Temperature.

Dependent: Solubility of potassium nitrate.

Controlled: Volume of water, purity of potassium nitrate, and measurement technique.

Methodology

Measure solubility at different temperatures using a water bath and analytical balance, consider using a wider temperature range to observe a more pronounced change in solubility.

Data Analysis

Graph solubility versus temperature, calculate the solubility curve.

Conclusion

Confirm the direct relationship between temperature and solubility.

Evaluation

Discuss experimental limitations and potential improvements.

Extension for HL

Create and analyze a solubility curve, investigate the effect of different solvents on the solubility of potassium nitrate.

#10Recommended Level: SL/HL

Investigating the Decomposition of Hydrogen Peroxide Using Different Catalysts

Research Question

How does the decomposition rate of hydrogen peroxide vary with different catalysts?

Rationale

Investigate the effect of different catalysts on reaction rates.

Background Information

Discuss decomposition reactions, catalysts, and their role in lowering activation energy.

Variables

Independent: Type of catalyst.

Dependent: Rate of decomposition.

Controlled: Concentration of hydrogen peroxide, temperature, and volume of solution.

Methodology

Measure oxygen production using a gas syringe with different catalysts, explore the use of different concentrations of hydrogen peroxide to determine the order of the reaction.

Data Analysis

Graph rate of decomposition versus type of catalyst, compare the effectiveness of each catalyst.

Conclusion

Determine which catalyst is most effective and why.

Evaluation

Discuss experimental limitations and potential improvements.

Extension for HL

Calculate and compare the activation energies for each catalyst, explore the mechanism of catalysis in detail. Students can use PhET Interactive Simulations to visualize collision theory and activation energy.

#11Recommended Level: SL/HL

Impact of Alcohol Chain Length on the Heat of Combustion

Research Question

How does the chain length of alcohols affect their heat of combustion?

Rationale

Understanding the relationship between molecular structure and energy content.

Background Information

Discusses combustion reactions, enthalpy changes, and molecular structure.

Variables

Independent: Chain length of alcohols.

Dependent: Heat of combustion.

Controlled: Volume of alcohol, experimental conditions, and measurement technique.

Methodology

Measure the heat released during the combustion of different straight-chain alcohols (e.g., methanol to pentanol) using a calorimeter. Ensure strict safety protocols for handling and burning alcohols.

Data Analysis

Graph heat of combustion versus chain length, analyze trends. Compare experimental results against theoretical values from the NIST Chemistry WebBook.

Conclusion

Determine how chain length affects the heat of combustion.

Evaluation

Discuss experimental limitations, safety measures, and potential improvements.

Extension for HL

Include branched alcohols to compare with straight-chain isomers, explore the relationship between molecular structure and enthalpy of combustion.

#12Recommended Level: SL/HL

Determining the Equilibrium Constant for the Esterification Reaction Between Ethanol and Acetic Acid

Research Question

What is the equilibrium constant for the esterification reaction between ethanol and acetic acid?

Rationale

Practical application of chemical equilibrium concepts.

Background Information

Discusses esterification reactions, equilibrium constants, and Le Chatelier's principle.

Variables

Independent: Concentrations of reactants.

Dependent: Equilibrium constant.

Controlled: Temperature, catalyst concentration, and reaction time.

Methodology

Measure concentrations at equilibrium using titration or spectroscopy. Allow sufficient time for equilibrium to be reached.

Data Analysis

Calculate the equilibrium constant, graph concentration changes.

Conclusion

Determine the equilibrium constant and discuss its significance.

Evaluation

Address accuracy and precision of measurements.

Extension for HL

Investigate the effect of different catalysts and temperature on the equilibrium constant.

#13HL

Effect of Temperature on Equilibrium Position of Cobalt Complex Ions

Research Question

How does temperature affect the equilibrium position of cobalt complex ions?

Rationale

Exploring advanced equilibrium concepts and thermodynamics.

Background Information

Discusses complex ion formation, equilibrium shifts, and thermodynamic principles.

Variables

Independent: Temperature.

Dependent: Equilibrium position.

Controlled: Concentration of cobalt ions, ligands, and solution volume.

Methodology

Measure absorbance changes using a spectrophotometer at different temperatures. Ensure you understand complex ion equilibria before attempting this investigation.

Data Analysis

Calculate equilibrium constants at various temperatures, graph results.

Conclusion

Determine the effect of temperature on equilibrium.

Evaluation

Discuss experimental limitations and potential improvements.

Extension for HL

#14Recommended Level: SL/HL

Investigating the Rate of Fermentation of Glucose by Yeast Under Different Conditions

Research Question

How does the rate of fermentation of glucose by yeast vary under different conditions?

Rationale

Understanding fermentation processes and factors affecting them.

Background Information

Discusses fermentation, enzyme activity, and factors influencing fermentation rates.

Variables

Independent: Conditions (temperature, pH, glucose concentration).

Dependent: Rate of fermentation.

Controlled: Yeast concentration, volume of solution.

Methodology

Measure CO2 production under different conditions using a gas syringe or CO2 sensor. Explore various methods to measure CO2 production accurately.

Data Analysis

Graph fermentation rate versus different conditions, analyze trends.

Conclusion

Determine optimal conditions for fermentation.

Evaluation

Discuss experimental limitations and safety precautions.

Extension for HL

Investigate enzyme kinetics in the fermentation process, consider the effect of different types of sugars on fermentation rate, calculate parameters like Vmax and Km.

#15HL

Effect of Ionic Strength on the Solubility of Calcium Sulfate

Research Question

How does ionic strength affect the solubility of calcium sulfate?

Rationale

Exploring solubility principles and ionic interactions.

Background Information

Discusses solubility, common ion effect, and ionic strength.

Variables

Independent: Ionic strength.

Dependent: Solubility of calcium sulfate.

Controlled: Temperature, concentration of calcium sulfate, and solution volume.

Methodology

Measure solubility at different ionic strengths using gravimetric or titration methods. Ensure precise concentration measurements. (different ionic strengths can be achieved by adding varying concentrations of an inert salt such as sodium chloride (NaCl) to the solution.)

Data Analysis

Graph solubility versus ionic strength, calculate solubility product constants.

Conclusion

Determine the effect of ionic strength on solubility.

Evaluation

Address accuracy and precision of measurements, discuss potential improvements.

Extension for HL

Research industrial applications of this principle.

#16Recommended Level: SL/HL

Determining the Activation Energy of the Reaction Between Sodium Thiosulfate and Hydrochloric Acid

Research Question

What is the activation energy of the reaction between sodium thiosulfate and hydrochloric acid?

Rationale

Understanding reaction kinetics and temperature dependence.

Background Information

Discusses activation energy, Arrhenius equation, and reaction kinetics.

Variables

Independent: Temperature.

Dependent: Reaction rate.

Controlled: Concentration of reactants, volume of solutions, and ambient conditions.

Methodology

Measure reaction rates at different temperatures, plot data using Arrhenius equation. Use a range of at least five different temperatures for accurate results.

Data Analysis

Calculate activation energy from the slope of the Arrhenius plot.

Conclusion

Determine activation energy and discuss its significance.

Evaluation

Address experimental limitations and potential improvements.

Extension for HL

Explore the effect of catalysts on activation energy, investigate the reaction mechanism in more depth. Validate your method using the Royal Society of Chemistry's guidelines.

#17Recommended Level: SL/HL

Impact of pH on the Rate of Hydrolysis of Starch by Amylase

Research Question

How does pH affect the rate of hydrolysis of starch by amylase?

Rationale

Investigating enzyme activity and pH dependence.

Background Information

Discusses enzyme function, hydrolysis reactions, and pH effects.

Variables

Independent: pH levels.

Dependent: Rate of hydrolysis.

Controlled: Temperature, enzyme concentration, and substrate concentration.

Methodology

Measure starch breakdown at different pH levels using iodine test or spectrophotometry. Maintain constant temperature during the experiment.

Data Analysis

Graph hydrolysis rate versus pH, identify optimal pH.

Conclusion

Determine optimal pH for amylase activity.

Evaluation

Discuss experimental limitations and potential improvements.

Extension for HL

Explore the relationship between pH and enzyme structure, use a wide range of pH values to clearly identify the optimal pH.

#18Recommended Level: SL/HL

Effect of Temperature on Viscosity of Motor Oils

Research Question

How does temperature affect the viscosity of motor oils?

Rationale

Practical exploration of viscosity principles and temperature dependence.

Background Information

Discusses viscosity, temperature effects, and lubrication.

Variables

Independent: Temperature.

Dependent: Viscosity.

Controlled: Type of motor oil, measurement technique, and experimental conditions.

Methodology

Measure viscosity at different temperatures using a viscometer. Ensure access to appropriate viscosity measurement tools.

Data Analysis

Graph viscosity versus temperature, analyze trends.

Conclusion

Determine how temperature affects viscosity.

Evaluation

Address experimental limitations and potential improvements.

Extension for HL

Compare different grades of motor oil, investigate the relationship between viscosity and molecular structure.

#19Recommended Level: SL/HL

Investigating the Corrosion Rate of Iron in Different pH Solutions

Research Question

How does the pH of a solution affect the corrosion rate of iron?

Rationale

Understanding corrosion processes and factors affecting them.

Background Information

Discusses corrosion mechanisms, pH effects, and electrochemical principles.

Variables

Independent: pH levels.

Dependent: Corrosion rate.

Controlled: Surface area of iron, temperature, and exposure time.

Methodology

Measure mass loss or use electrochemical methods to determine corrosion rate. Explore both acidic and basic conditions, not just acidic.

Data Analysis

Graph corrosion rate versus pH, analyze trends.

Conclusion

Determine the effect of pH on corrosion rate.

Evaluation

Discuss experimental limitations and safety precautions.

Extension for HL

Investigate electrochemical aspects of corrosion in more depth.

#20Recommended Level: SL/HL

Determining the Water Content in Hydrated Copper(II) Sulfate

Research Question

What is the water content in hydrated copper(II) sulfate determined through dehydration?

Rationale

Practical application of dehydration principles and stoichiometry.

Background Information

Discusses hydration, dehydration processes, and stoichiometric calculations.

Variables

Independent: Mass of hydrated copper(II) sulfate.

Dependent: Water content.

Controlled: Temperature, heating duration, and measurement technique.

Methodology

Heat the hydrated compound, measure mass before and after heating, calculate water content. Emphasize the importance of accurate mass measurements.

Data Analysis

Calculate percentage of water, graph results.

Conclusion

Determine the water content in hydrated copper(II) sulfate.

Evaluation

Address accuracy and precision of measurements, discuss potential improvements.

Extension for HL

Compare results with the theoretical water content, investigate the kinetics of the dehydration process.

#21Recommended Level: SL/HL

Effect of Concentration on the Rate of Reaction Between Hydrochloric Acid and Magnesium

Research Question

How does the concentration of hydrochloric acid affect the rate of reaction with magnesium?

Rationale

Exploring the relationship between reactant concentration and reaction rate.

Background Information

Discusses reaction kinetics, concentration effects, and collision theory.

Variables

Independent: Concentration of hydrochloric acid.

Dependent: Reaction rate.

Controlled: Surface area of magnesium, volume of acid, and temperature.

Methodology

Measure hydrogen gas production using a gas syringe or mass loss method at different concentrations of hydrochloric acid. Explore different methods to measure reaction rate.

Data Analysis

Graph reaction rate versus acid concentration, analyze trends.

Conclusion

Determine how concentration affects reaction rate.

Evaluation

Discuss experimental limitations and potential improvements.

Extension for HL

Determine the order of reaction and rate law, investigate the effect of temperature as an extension. Visualize the reaction kinetics using PhET Interactive Simulations.

#22Recommended Level: SL/HL

Investigating the Adsorption of Acetic Acid onto Activated Charcoal

Research Question

How does the concentration of acetic acid affect its adsorption onto activated charcoal?

Rationale

Understanding adsorption processes and surface chemistry.

Background Information

Discusses adsorption, surface area, and equilibrium.

Variables

Independent: Initial concentration of acetic acid.

Dependent: Amount of acetic acid adsorbed.

Controlled: Mass of activated charcoal, temperature, and contact time.

Methodology

Measure the concentration of acetic acid before and after adsorption using titration or spectrophotometry. Ensure sufficient equilibration time.

Data Analysis

Plot adsorption isotherms, calculate adsorption capacities.

Conclusion

Determine how acetic acid concentration affects adsorption.

Evaluation

Address accuracy and precision of measurements.

Extension for HL

Compare different adsorption isotherm models (e.g., Langmuir, Freundlich), explore different types of activated charcoal.

#23Recommended Level: SL/HL

Impact of Temperature on the Rate of Diffusion of Food Coloring in Water

Research Question

How does temperature affect the rate of diffusion of food coloring in water?

Rationale

Exploring diffusion processes and temperature dependence.

Background Information

Discusses diffusion, temperature effects, and kinetic theory.

Variables

Independent: Temperature.

Dependent: Rate of diffusion.

Controlled: Concentration of food coloring, volume of water, and container size.

Methodology

Measure the rate of diffusion by observing the spread of food coloring in water at different temperatures. Use a more quantitative method to measure diffusion rate.

Data Analysis

Graph diffusion rate versus temperature, analyze trends.

Conclusion

Determine how temperature affects diffusion rate.

Evaluation

Discuss experimental limitations and potential improvements.

Extension for HL

Investigate the activation energy of diffusion, explore the effect of different food coloring molecules.

#24Recommended Level: SL/HL

Determining the Molar Mass of a Volatile Liquid Using the Ideal Gas Law

Research Question

What is the molar mass of a volatile liquid determined using the ideal gas law?

Rationale

Practical application of gas laws and molar mass determination.

Background Information

Discusses ideal gas law, molar mass, and gas behavior.

Variables

Independent: Volume of gas.

Dependent: Molar mass.

Controlled: Temperature, pressure, and amount of liquid.

Methodology

Evaporate a known amount of liquid in a gas syringe or a flask and measure the volume of gas produced. Emphasize the importance of accurate temperature and pressure measurements.

Data Analysis

Use the ideal gas law to calculate the molar mass.

Conclusion

Determine the molar mass of the volatile liquid.

Evaluation

Address accuracy and precision of measurements.

Extension for HL

Explore deviations from ideal gas behavior, compare results with other methods of molar mass determination.

#25Recommended Level: SL/HL

Effect of Different Metal Ions on the Flame Color in a Flame Test

Research Question

How do different metal ions affect the color of the flame in a flame test?

Rationale

Understanding flame tests and emission spectra of metal ions.

Background Information

Discusses flame tests, emission spectra, and electron transitions.

Variables

Independent: Type of metal ion.

Dependent: Flame color.

Controlled: Concentration of metal salts, flame temperature, and observation method.

Methodology

Perform flame tests on different metal salts and observe the flame color using a spectroscope if available. Ensure proper safety measures for handling flames and chemicals.

Data Analysis

Record and compare flame colors, analyze spectra.

Conclusion

Determine the characteristic flame colors of different metal ions.

Evaluation

Discuss accuracy and potential improvements.

Extension for HL

Link flame colors to electron transitions and energy levels, analyze the emission spectra in detail.

#26Recommended Level: SL/HL

Investigating the Electroplating Process of Copper

Research Question

How does the concentration of copper sulfate solution affect the rate of electroplating copper onto a metal substrate?

Rationale

Practical application of electrochemistry and electroplating.

Background Information

Discusses electroplating, electrolytes, and electrodeposition.

Variables

Independent: Concentration of copper sulfate solution.

Dependent: Rate of electroplating.

Controlled: Voltage, temperature, and duration.

Methodology

Perform electroplating with varying concentrations of copper sulfate and measure the mass of copper deposited. Emphasize the importance of surface preparation in electroplating.

Data Analysis

Graph rate of electroplating versus concentration, analyze trends.

Conclusion

Determine how copper sulfate concentration affects the rate of electroplating.

Evaluation

Address accuracy and precision of measurements.

Extension for HL

Explore the effects of current density on plating quality, investigate the efficiency of the electroplating process.

#27Recommended Level: SL/HL

Determining the Enthalpy Change of Neutralization for Strong Acids and Bases

Research Question

What is the enthalpy change of neutralization for reactions between strong acids and bases?

Rationale

Understanding thermodynamics of neutralization reactions.

Background Information

Discusses enthalpy change, calorimetry, and neutralization.

Variables

Independent: Type of acid and base.

Dependent: Enthalpy change.

Controlled: Concentration of reactants, volume of solutions, and temperature.

Methodology

Perform neutralization reactions in a calorimeter and measure temperature changes. Emphasize the importance of insulation in calorimetry experiments.

Data Analysis

Calculate enthalpy changes, compare results.

Conclusion

Determine the enthalpy change of neutralization for different acid-base pairs.

Evaluation

Address accuracy and precision of measurements.

Extension for HL

Explore the enthalpy change for weak acids and bases, compare results for different acid-base combinations.

#28HL

Effect of Pressure on the Solubility of Gases in Liquids

Research Question

How does pressure affect the solubility of gases in liquids?

Rationale

Exploring gas solubility principles and Henry's law.

Background Information

Discusses solubility of gases, pressure effects, and Henry's law.

Variables

Independent: Pressure.

Dependent: Solubility of gas.

Controlled: Temperature, type of gas, and solvent.

Methodology

Measure the solubility of a gas in a liquid at different pressures using a pressure vessel. Emphasize safety when working with pressurized systems.

Data Analysis

Graph solubility versus pressure, analyze trends.

Conclusion

Determine how pressure affects gas solubility.

Evaluation

Address experimental limitations and safety precautions.

Extension for HL

Explore Henry's law in depth, investigate the solubility of different gases in various solvents.

#29Recommended Level: SL/HL

Investigating the Rate of Reaction Between Potassium Iodide and Hydrogen Peroxide

Research Question

How does the concentration of potassium iodide affect the rate of reaction with hydrogen peroxide?

Rationale

Exploring reaction kinetics and concentration dependence.

Background Information

Discusses reaction kinetics, iodine clock reaction, and concentration effects.

Variables

Independent: Concentration of potassium iodide.

Dependent: Reaction rate.

Controlled: Concentration of hydrogen peroxide, temperature, and volume.

Methodology

Measure the time taken for the reaction to reach a certain endpoint (e.g., color change) at different concentrations of potassium iodide.

Data Analysis

Graph reaction rate versus concentration, analyze trends.

Conclusion

Determine how potassium iodide concentration affects reaction rate.

Evaluation

Discuss accuracy and precision of measurements.

Extension for HL

Determine the rate law and reaction mechanism, explore the effect of temperature and catalysts on the reaction rate.

#30Recommended Level: SL/HL

Effect of Solvent Polarity on the Solubility of Organic Compounds

Research Question

How does the polarity of solvents affect the solubility of organic compounds?

Rationale

Understanding solubility principles and solvent effects.

Background Information

Discusses solubility, polarity, and molecular interactions.

Variables

Independent: Solvent polarity.

Dependent: Solubility of organic compounds.

Controlled: Temperature, concentration of organic compounds, and volume of solvent.

Methodology

Measure the solubility of organic compounds in solvents of varying polarity using gravimetric or spectrophotometric methods. Advise on safety precautions when handling organic solvents.

Data Analysis

Graph solubility versus solvent polarity, analyze trends.

Conclusion

Determine how solvent polarity affects solubility.

Evaluation

Address accuracy and precision of measurements.

Extension for HL

Explore the relationship between solubility and intermolecular forces, use a range of solvents with varying polarities.

#31Recommended Level: SL/HL

Determining the Percentage Purity of Aspirin Tablets Using Back Titration

Research Question

What is the percentage purity of aspirin tablets determined using back titration?

Rationale

Practical application of titration techniques and purity analysis.

Background Information

Discusses back titration principles, aspirin composition, and purity analysis.

Variables

Independent: Aspirin tablets.

Dependent: Percentage purity.

Controlled: Concentration of titrants, volume of solutions, and titration technique.

Methodology

Perform back titration using a standard solution of sodium hydroxide to react with aspirin, then titrate the excess sodium hydroxide with hydrochloric acid.

Data Analysis

Calculate the percentage purity of the aspirin tablets.

Conclusion

Determine the purity of aspirin tablets and compare with label claims.

Evaluation

Discuss accuracy and precision of measurements.

Extension for HL

Compare results with other analytical methods (e.g., HPLC), investigate the effect of tablet coating on the analysis.

#32Recommended Level: SL/HL

Impact of Different Cooking Methods on the Vitamin C Content in Vegetables

Research Question

How do different cooking methods affect the vitamin C content in vegetables?

Rationale

Evaluating the nutritional value of vegetables after cooking.

Background Information

Discusses vitamin C stability, cooking methods, and nutritional analysis.

Variables

Independent: Cooking methods (boiling, steaming, microwaving).

Dependent: Vitamin C content.

Controlled: Type of vegetable, cooking duration, and volume of water.

Methodology

Measure vitamin C content using titration or spectrophotometry before and after cooking.

Data Analysis

Compare vitamin C content across different cooking methods.

Conclusion

Determine the impact of cooking methods on vitamin C content.

Evaluation

Discuss experimental limitations and potential improvements.

Extension for HL

Explore a wider range of cooking methods and vegetables, investigate the effect of storage conditions on vitamin C content.

#33Recommended Level: SL/HL

Effect of Temperature on the Rate of Rusting of Iron

Research Question

How does temperature affect the rate of rusting of iron?

Rationale

Understanding corrosion processes and temperature dependence.

Background Information

Discusses rusting, oxidation reactions, and temperature effects.

Variables

Independent: Temperature.

Dependent: Rate of rusting.

Controlled: Surface area of iron, concentration of corrosive medium, and exposure time.

Methodology

Measure mass loss or use electrochemical methods to determine rusting rate at different temperatures.

Data Analysis

Graph rusting rate versus temperature, analyze trends.

Conclusion

Determine how temperature affects the rate of rusting.

Evaluation

Discuss experimental limitations and potential improvements.

Extension for HL

Explore the effect of different environmental factors (e.g., salinity, humidity), use digital imaging techniques for more quantitative rust analysis.

#34Recommended Level: SL/HL

Investigating the Chromatography of Different Plant Pigments

Research Question

How can chromatography be used to separate and identify different plant pigments?

Rationale

Exploring chromatography techniques and pigment analysis.

Background Information

Discusses chromatography principles, plant pigments, and separation techniques.

Variables

Independent: Type of plant extract.

Dependent: Rf values of pigments.

Controlled: Solvent system, concentration of extracts, and chromatography paper.

Methodology

Perform paper or thin-layer chromatography on different plant extracts and calculate Rf values.

Data Analysis

Identify and compare pigments based on Rf values.

Conclusion

Determine the effectiveness of chromatography in separating plant pigments.

Evaluation

Discuss accuracy and precision of measurements.

Extension for HL

Compare results from different chromatography techniques (paper, TLC, column), investigate seasonal variations in plant pigment composition.

#35Recommended Level: SL/HL

Determining the Iron Content in Spinach Using Spectrophotometry

Research Question

What is the iron content in spinach determined using spectrophotometry?

Rationale

Evaluating the nutritional value of spinach and applying spectrophotometric techniques.

Background Information

Discusses spectrophotometry principles, iron content, and nutritional analysis.

Variables

Independent: Spinach samples.

Dependent: Iron content.

Controlled: Sample preparation, concentration of reagents, and spectrophotometer settings.

Methodology

Prepare spinach extracts, react with a colorimetric reagent, and measure absorbance using a spectrophotometer.

Data Analysis

Calculate iron content based on calibration curves.

Conclusion

Determine the iron content in spinach and compare with nutritional labels.

Evaluation

Discuss accuracy and precision of measurements.

Extension for HL

Compare results with atomic absorption spectroscopy if available, explore the bioavailability of iron in different forms of spinach (raw vs. cooked).

#36Recommended Level: SL/HL

Effect of Acid Rain on the Rate of Decomposition of Limestone

Research Question

How does acid rain affect the rate of decomposition of limestone?

Rationale

Understanding environmental impacts of acid rain on carbonate rocks.

Background Information

Discusses acid rain composition, chemical weathering, and limestone decomposition.

Variables

Independent: Concentration of acidic solution.

Dependent: Rate of decomposition.

Controlled: Surface area of limestone, volume of solution, and temperature.

Methodology

Measure mass loss or gas production as limestone reacts with different concentrations of acid.

Data Analysis

Graph decomposition rate versus acid concentration, analyze trends.

Conclusion

Determine how acid rain affects limestone decomposition.

Evaluation

Discuss experimental limitations and potential improvements.

Extension for HL

Investigate the buffering capacity of different types of limestone, explore the impact of acid rain on other building materials.

#37Recommended Level: SL/HL

Investigating the Conductivity of Ionic Solutions at Different Concentrations

Research Question

How does the concentration of an ionic solution affect its conductivity?

Rationale

Exploring the relationship between ionic concentration and electrical conductivity.

Background Information

Discusses conductivity principles, ion mobility, and concentration effects.

Variables

Independent: Concentration of ionic solution.

Dependent: Conductivity.

Controlled: Type of ionic compound, temperature, and volume of solution.

Methodology

Measure the conductivity of ionic solutions at different concentrations using a conductivity meter.

Data Analysis

Graph conductivity versus concentration, analyze trends.

Conclusion

Determine how concentration affects the conductivity of ionic solutions.

Evaluation

Discuss accuracy and precision of measurements.

Extension for HL

Investigate the effect of temperature on conductivity and compare different ionic compounds.

#38HL

Determining the Rate Constant of a Reaction Using the Iodine Clock Method

Research Question

What is the rate constant of a reaction determined using the iodine clock method?

Rationale

Applying reaction kinetics principles and the iodine clock reaction.

Background Information

Discusses reaction kinetics, iodine clock reaction, and rate constants.

Variables

Independent: Concentration of reactants.

Dependent: Reaction time.

Controlled: Temperature, volume of solutions, and reaction conditions.

Methodology

Perform the iodine clock reaction with varying concentrations of reactants and measure the time taken for the color change.

Data Analysis

Calculate the rate constant from the reaction times and concentrations.

Conclusion

Determine the rate constant of the reaction.

Evaluation

Discuss accuracy and precision of measurements.

Extension for HL

Investigate the effect of catalysts on the reaction rate, explore the reaction mechanism in more detail.

#39Recommended Level: SL/HL

Effect of Concentration on the Color Intensity of a Transition Metal Complex

Research Question

How does the concentration of a transition metal complex affect its color intensity?

Rationale

Understanding the relationship between concentration and color intensity in transition metal complexes.

Background Information

Discusses transition metal complexes, color intensity, and concentration effects.

Variables

Independent: Concentration of the complex.

Dependent: Color intensity.

Controlled: Type of transition metal complex, solvent, and path length.

Methodology

Prepare solutions of varying concentrations and measure absorbance using a spectrophotometer.

Data Analysis

Graph absorbance versus concentration, apply Beer-Lambert law.

Conclusion

Determine how concentration affects color intensity.

Evaluation

Discuss accuracy and precision of measurements.

Extension for HL

Explore the effect of pH on complex formation and color, investigate the spectrochemical series with different metal ions.

#40Recommended Level: SL/HL

Investigating the Kinetics of the Decomposition of Hydrogen Peroxide

Research Question

What are the kinetics of the decomposition of hydrogen peroxide?

Rationale

Exploring reaction kinetics and decomposition processes.

Background Information

Discusses decomposition reactions, hydrogen peroxide stability, and kinetic theory.

Variables

Independent: Concentration of hydrogen peroxide.

Dependent: Rate of decomposition.

Controlled: Temperature, volume of solution, and presence of catalysts.

Methodology

Measure oxygen production using a gas syringe or pressure sensor at different concentrations of hydrogen peroxide.

Data Analysis

Graph decomposition rate versus concentration, analyze trends.

Conclusion

Determine the kinetics of hydrogen peroxide decomposition.

Evaluation

Discuss experimental limitations and potential improvements.

Extension for HL

Investigate the effect of light on the decomposition rate, explore the use of different catalysts and their mechanisms.

General Recommendations

Important guidelines to consider for all Chemistry IA topics

Safety Considerations

Emphasize safety protocols, especially for experiments involving flames, acids, and potentially harmful chemicals. Ensure proper waste disposal and environmental considerations.

Thorough Literature Reviews

Conduct detailed literature reviews to inform your methodologies and understand the theoretical background.

Error Analysis and Uncertainty

Highlight the importance of error analysis and uncertainty calculations in all experiments.

Real-World Applications

Relate experiments to real-world applications to enhance engagement and understanding.

Interdisciplinary Connections

Create connections to other disciplines, such as biology, environmental science, and physics, where relevant. Be careful not to go awry though as it might lead to the rejection or low score.

Use of Digital Tools

Use digital tools for data collection, analysis, and visualization to improve accuracy and presentation.

Expert Guidance

At Hack Your Course, our experienced tutors are dedicated to assisting students in selecting the most suitable topics and effectively writing their internal assessments. As the premier IB-focused tutoring service in Canada and the USA, we've been specializing in IB education since 2015. Our commitment to excellence ensures that students receive personalized guidance tailored to the rigorous demands of the IB curriculum, helping them achieve their academic goals with confidence.

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Frequently Asked Questions

Find answers to common questions about IB Chemistry Internal Assessments

Selection & Complexity

How do I choose a topic that's appropriately complex for my level (SL or HL)?

Pick a research question that lets you show clear chemistry understanding at your course level and that you can investigate well with the time and equipment you actually have. Complexity should come from strong scientific thinking (good control of variables, thoughtful processing, and a chemistry-based rationale), not from adding extra variables or fancy theory you can't explain. If you're HL, you can often justify deeper theory or more advanced processing—but focus and execution still matter more than "difficulty." For more guidance on what makes a strong IA, explore our Science IA guide.

What's the ideal scope for a Chemistry IA investigation?

Keep it narrow and doable: the Chemistry IA is intended to be a single investigation that can be completed in about 10 hours and reported concisely in roughly 6–12 pages. A good scope usually means one main independent variable, a measurable dependent variable, and a method you can repeat reliably. Avoid projects that sprawl into multiple research questions or need equipment/chemicals you can't access consistently. Review our complete internal assessment guide for more on the IA structure and expectations.

Can I use potentially hazardous chemicals in my IA?

Yes—if your school permits it and you can demonstrate safe, responsible practice. Follow your teacher and school safety rules, use appropriate PPE, and reference relevant Safety Data Sheets (SDS). In your write-up, briefly document hazards, controls, and safe disposal. If a substance is restricted at your school, redesign the investigation rather than trying to "force" a risky setup.

How important is it that my topic connects to real-world applications?

It's helpful, not mandatory. A real-world context can make your rationale and discussion more meaningful, but "pure chemistry" topics can score just as well when the research question is focused and the analysis is strong. The key is showing clear chemical understanding and thoughtful interpretation—whether the context is practical or theoretical.

Should I choose a topic I'm passionate about, or one that seems "safer" for scoring?

Choose the intersection: genuinely interesting + realistically doable. Personal engagement is a small but real part of the IA marks (2 out of 24), so interest helps—but you'll earn most marks through solid exploration, analysis, and evaluation. A "safe" topic only works if you execute it well and keep the chemistry central. A topic you love usually leads to better explanations and a stronger evaluation. Learn more about IB grading guidelines to understand the marking criteria.

Can I modify an existing research study for my IA?

Yes. Adapting a published method is common and valid—just cite your sources clearly and explain what you changed and why. Your IA should show your thinking: how you chose variables, justified the method, controlled conditions, processed data, and evaluated limitations. A strong adaptation typically simplifies equipment demands while keeping the chemistry and analysis rigorous.

What role does the research question play in determining the success of my IA?

It's the backbone of the whole investigation. A strong research question is specific, measurable, and clearly identifies the independent and dependent variables. It should lead naturally to a method that produces data you can analyze meaningfully. If the question is vague or too broad, everything downstream (controls, graphs, conclusions, evaluation) becomes harder to do well.

How can I make my IA topic more original or unique?

Originality usually comes from your approach, not a never-before-seen reaction. Make it yours by choosing a specific angle, comparing meaningful conditions, tightening the question, or improving the method and analysis (better control strategy, uncertainty treatment, clearer scientific reasoning). Even classic experiments can feel "high-level" when the design and evaluation are thoughtful and well justified.

Is it okay to choose a topic outside the IB Chemistry syllabus?

Yes—with caution. Your IA must still demonstrate chemistry knowledge and skills, so the chemistry should remain central and explainable at DP level. Interdisciplinary ideas are fine as long as you don't drift into a project that's mostly biology/physics/engineering with only light chemistry. If you go beyond syllabus content, be extra careful to explain concepts clearly and accurately. Explore the full IB Programme overview to understand how Chemistry fits into your diploma.

Execution & Data Analysis

How many data points or trials should I include in my experiment?

There's no official fixed number, but you should collect enough data to show a credible pattern and support a conclusion. A practical guideline is: multiple values of the independent variable (to reveal a trend) plus repeats (to show reliability). Balance quantity with quality—clean technique, consistent controls, and accurate measurement often matter more than squeezing in extra trials.

What types of graphs and charts should I use to present my data?

Use graphs that match the type of relationship you're testing. Scatter plots are often best for continuous variables, and adding a best-fit line can help you describe trends—especially if it supports your conclusion. Include uncertainty (error bars or stated uncertainties) where appropriate, label axes with units, and make sure every graph is referenced in your analysis (don't include graphs that you never interpret).

How do I calculate and report uncertainties correctly?

Start with instrument uncertainties (resolution or manufacturer specs), then show how uncertainty affects processed results and your conclusion. For derived quantities, use standard propagation ideas (e.g., recognized measurement-uncertainty guidance) and keep significant figures consistent with the uncertainty. The goal is clarity: what was uncertain, by how much, and how that uncertainty influences the strength of your claim. Similar mathematical analysis principles apply in the Math IA.

What should I do if my experimental results don't match theoretical predictions?

Treat it as a scientific opportunity. First verify basics (method consistency, calibration, contamination, timing, temperature control). Then compare your results to accepted chemistry and explain plausible reasons for the mismatch (side reactions, equilibrium shifts, heat loss, catalyst changes, measurement bias). Strong IAs don't require "perfect" results—they require careful reasoning and an honest, specific evaluation. If you're struggling with data interpretation, our IB tutoring can provide personalized guidance.

How important is it to discuss sources of error in my IA?

Very important. Go beyond generic statements like "human error." Identify specific limitations, explain how each one could affect the data or trend, and propose realistic improvements. A good evaluation also connects limitations to the conclusion (how confident are you, and why?), which makes your scientific judgement look mature. Check out our tips for IB students for more guidance on approaching assessments effectively.

Should I use statistical tests on my data?

Only if they help answer your research question and you can explain them clearly. Simple statistics (mean, standard deviation, regression) can strengthen your analysis when used appropriately. Avoid using tests just to look advanced—misused statistics can weaken credibility. If you include a test, interpret what it means in your experiment, not just as a number.

How do I know if my data supports or refutes my hypothesis?

Check whether your results show the predicted trend and whether differences are meaningful relative to uncertainty and variability. Use your processed data and graphs to justify the conclusion, and compare to accepted chemistry where relevant. A refuted hypothesis is not a failure—if your analysis and evaluation are strong, it can still be an excellent IA. Your IA contributes to your overall IB Programme score.

Can I use spreadsheet software or programming for data analysis?

Yes—spreadsheets and coding tools are great for calculations, graphs, regressions, and uncertainty processing. Just make sure you understand what the software is doing and can explain key steps in your write-up. Technology should make your reasoning clearer, not replace it.

What if I don't have access to advanced lab equipment?

That's completely workable. Many strong IAs use simple equipment well: careful control of variables, consistent technique, sensible repeats, and honest uncertainty treatment. If limited equipment affects precision, acknowledge it and explain how better tools would improve the method. Thoughtful design and evaluation can outweigh fancy instruments.

How do I interpret unexpected trends in my data?

Start by checking for experimental causes (measurement drift, inconsistent timing, evaporation, contamination, temperature variation). Then consider chemistry explanations (side reactions, equilibrium behavior, solubility effects, catalyst deactivation, saturation limits). Use evidence: point to where the trend appears, propose plausible mechanisms, and explain what additional data or method changes would test your explanation.

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