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IB Chemistry IA Ideas: 30 Topics That Meet the Criteria
18th August, 2026 | Abhishek Malani | 10 Min Read
Introduction
Finding good IB Chemistry IA ideas is harder to find than they look; plenty of ideas seem interesting but end up producing thin data, a single measured value, or a setup your school’s labs genuinely can’t support. At Quest for Success, we’ve put together 30 chemistry IA topics, organized by area of the syllabus, each built around a testable research question and realistic school-lab equipment. Because these underlying chemical relationships don’t change from one syllabus cycle to the next, this list is designed to stay useful as a genuine starting point for brainstorming, regardless of specific assessment criteria updates in any given year.
Table of Contents
What Makes a Strong IB Chemistry IA Topic
The IB Chemistry Internal Assessment, officially the Scientific Investigation, is a self-directed report worth 20% of your final grade at both SL and HL, assessed against four equally weighted criteria totaling 24 marks: Research Design, Data Analysis, Conclusion, and Evaluation. Regardless of exact word counts or formatting details in a given syllabus year, the traits that consistently separate strong chemistry IA ideas from weak ones stay the same:
- A continuous, quantifiable independent and dependent variable: Titration volumes, concentrations, temperatures, and rates all lend themselves to the kind of graphing and statistical analysis the criteria reward; simple yes/no or present/absent comparisons don’t.
- Equipment genuinely available in a school lab. Titrations, colorimetry, calorimetry, and simple electrochemical cells are almost universally accessible; anything requiring specialist instrumentation like NMR or mass spectrometry usually isn’t, no matter how compelling it sounds on paper.
- A clear link to a specific chemical principle, rate laws, equilibrium constants, enthalpy changes, or solubility trends, so your evaluation and conclusion sections have real theory to compare your results against.
- Enough repeat trials and range in your independent variables to support genuine uncertainty analysis, since a substantial share of the marks reward how well you interpret and critically evaluate your data, not just what number you arrived at.
Turning a Topic into a Testable Research Question
Before browsing chemistry IA topic ideas, it’s worth understanding what separates a workable research question from a vague one, since the same topic idea can produce very different quality investigations depending on how it’s framed:
- Name both variables and their units explicitly: “How does concentration affect reaction rate?” is vague; “How does the concentration of hydrochloric acid (mol dm⁻³) affect the rate of its reaction with sodium thiosulfate, measured via time to reach a fixed turbidity?” is testable.
- State what you’re holding constant: A strong question implies your controlled variables, temperature, volume, particle size, before you even start your methodology.
- Anchor the question to a specific chemical concept or equation: (rate law, Kc, Ka, Hess’s Law, Faraday’s laws), so your data analysis has a clear theoretical prediction to compare against.
- Keep the scope realistic: A topic that would genuinely require a university analytical lab to answer properly is one of the most common reasons an ambitious idea underperforms in practice.
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30 IB Chemistry IA Ideas with Research Questions
Reaction Kinetics
- Concentration and reaction rate: How does the concentration of hydrochloric acid affect the rate of its reaction with sodium thiosulfate, measured by time to a fixed turbidity endpoint?
- Temperature and reaction rate: How does temperature affect the rate constant of the reaction between magnesium and hydrochloric acid, and how well does the result support the Arrhenius equation?
- Catalyst surface area: How does the surface area of manganese dioxide catalyst affect the rate of decomposition of hydrogen peroxide?
Chemical Equilibrium
4. Temperature and equilibrium position: How does temperature affect the position of equilibrium in the cobalt(II) chloride complex ion system, measured via colorimetry?
5. Concentration and Le Chatelier’s principle: How does changing the concentration of iron(III) ions affect the equilibrium position of the iron(III) thiocyanate system, measured via absorbance?
Acids and Bases
6. Determining Ka of a weak acid: How can the acid dissociation constant of ethanoic acid be determined from a pH titration curve, and how does it compare to the literature value?
7. Temperature and Kw: How does temperature affect the ionic product of water, Kw, as measured through the pH of neutral water at varying temperatures?
8. Buffer capacity: How does the concentration of a buffer’s components affect its capacity to resist pH change upon addition of a strong acid?
Thermochemistry
9. Enthalpy of combustion and chain length: How does the chain length of a series of primary alcohols affect their experimentally determined enthalpy of combustion?
10. Enthalpy of neutralization: How does the identity of the acid and base used affect the enthalpy of neutralization measured calorimetrically?
11. Hess’s Law application: What is the enthalpy of formation of magnesium oxide, determined indirectly using Hess’s Law and two measurable reactions?
Electrochemistry
12. Electrolyte concentration and cell voltage: How does the concentration of electrolyte in a galvanic cell’s half-cells affect its measured cell potential?
13. Electrode material and reactivity: How does the identity of the metal electrode affect the cell potential of a simple galvanic cell, and how well does this align with the standard reactivity series?
14. Electrolysis and Faraday’s Laws: How does the current used during electrolysis affect the mass of copper deposited at the cathode, and how closely does this match the prediction from Faraday’s Laws?
Organic Chemistry
15. Chain length and boiling point: How does the carbon chain length of a homologous series of alcohols affect their boiling point, and how does this relate to intermolecular forces?
16. Esterification rate: How does the branching of an alcohol affect the rate of esterification with a fixed carboxylic acid?
17. Halogenation kinetics: How does the concentration of acid catalyst affect the rate of the iodination of propanone?
Analytical Chemistry and Titrations
18. Vitamin C content in juices: How does the vitamin C content, determined by iodometric titration, compare across different fruit juice brands?
19. Acetic acid content of vinegar: How does the concentration of acetic acid, determined by acid-base titration, compare across different commercial vinegar brands?
20. Water hardness: How does the total hardness of tap water, determined by EDTA complexometric titration, compare across different water sources?
Environmental and Green Chemistry
21. Natural pH indicators: How does the effectiveness of a natural indicator, such as red cabbage extract, compare to a standard synthetic indicator across a range of known pH values?
22. Plastic degradation: How does the pH of the surrounding environment affect the rate of mass loss of a biodegradable plastic sample over time?
23. Natural water coagulants: How does the concentration of a natural coagulant, such as moringa seed extract, affect the turbidity reduction of a standardized cloudy water sample?
Structure, Bonding, and Solubility
24. Group 2 sulfate solubility trend: How does the identity of the Group 2 cation affect the solubility of its sulfate salt, and how does this relate to lattice and hydration enthalpies?
25. Temperature and solubility: How does temperature affect the solubility of potassium nitrate in water, and what enthalpy of solution can be derived from the resulting data?
26. Intermolecular forces and evaporation rate: How does the type of intermolecular force present in a series of organic solvents affect their rate of evaporation under identical conditions?
27. Antioxidant capacity of beverages: How does the antioxidant capacity of different types of tea, determined by titration against a DPPH or iodine solution, compare across brewing times?
28. Enzyme activity and pH: How does pH affect the rate of hydrogen peroxide decomposition catalyzed by catalase extracted from a common food source?
29. Antacid effectiveness: How does the calcium carbonate content of different antacid tablet brands, determined by back-titration, compare to their advertised values
30. Caffeine content of beverages: How does the caffeine content of different beverages, determined through extraction and a suitable analytical method, compare across brands or brewing methods?
Common Mistakes When Choosing a Topic
- Choosing a topic before confirming lab access: Many popular IB Chem IA ideas, like anything requiring spectrophotometry beyond a basic colorimeter, need to be checked against your school’s actual equipment before you commit.
- Relying on a single measured value: A strong investigation needs a genuine range across the independent variable, typically 6–10 distinct values with repeated trials, not a single before-and-after comparison.
- Skipping a literature comparison: The strongest chemistry IAs consistently compare their experimental result (a Ka, an enthalpy change, a rate constant) against an accepted literature value, giving the evaluation section something concrete to discuss.
- Underestimating safety and ethical considerations: Topics involving certain reagents, biological material, or environmental sampling need a clear safety and ethical plan built in from the start, not added as an afterthought.
- Picking a topic purely because it sounds unusual: Examiners consistently reward a well-executed, simple investigation with thorough analysis over an unusual topic let down by unreliable data or poor variable control.
How Quest for Success Can Help
A strong IB Chemistry choosing from multiple possible IB Chem IA topics is only the first step; the real task is scoping a research question that matches your school’s equipment and gives you enough data to genuinely analyse and evaluate. At Quest for Success, we refine a short list of ideas into a focused, well-controlled investigation, then guide the methodology, data analysis and evaluation stages so the final report reflects real, independent scientific thinking.
Summary
Strong IB chemistry IA ideas consistently combine a continuous, measurable variable, equipment genuinely available in a school lab, and a clear link to a specific chemical principle that gives your evaluation section real theory to engage with. The 30 topics above span kinetics, equilibrium, acids and bases, thermochemistry, electrochemistry, organic chemistry, analytical titrations, environmental chemistry, solubility, and food chemistry, each framed as a specific, testable research question you can adapt to your own school’s resources. Whichever topic you choose, naming your variables explicitly, anchoring your question to a known chemical relationship, and planning for genuine repeated-trial data from the start consistently produce stronger, more analytically rich investigations than broader, less defined topics.
FAQs
A good topic uses a continuous, measurable variable, equipment your school actually has, and a clear connection to a specific chemical principle, giving you enough data for meaningful analysis and evaluation.
Yes, secondary data is permitted, though most strong investigations combine primary, hands-on data collection with a clear methodology, since this typically supports stronger evaluation and personal engagement.
Most strong investigations use at least 6–10 distinct values across the independent variable, with repeated trials at each point to support real uncertainty analysis.
Yes, where possible. Comparing your experimental result to an accepted literature value, like a known Ka or enthalpy change, gives your evaluation section a concrete, specific point of discussion.
Not necessarily. A simple, well-executed investigation with thorough, thoughtful analysis typically scores higher than an ambitious topic let down by unreliable data or poor variable control.
Need help narrowing down your IB Chemistry IA topic or refining your research question? Reach out to Quest for Success; we’re here to help you turn a solid idea into a genuinely strong investigation.
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