IB Chemistry IA Ideas: 50 Topics That Score High

Choosing the right topic for your IB Chemistry Internal Assessment can feel overwhelming. With so many possibilities and the pressure to select something that will earn you top marks, it’s natural to feel stuck. The good news? You’ve come to the right place. This comprehensive guide presents 50 high-scoring IB Chemistry IA ideas across multiple categories, along with expert tips to help you craft an investigation that showcases your scientific skills and earns those coveted marks.

Understanding the IB Chemistry IA: What You Need to Know

Before diving into topic ideas, let’s understand what makes a successful Chemistry IA. The Internal Assessment accounts for 20% of your final IB Chemistry grade, whether you’re taking Standard Level or Higher Level. As of the 2026 curriculum updates, your IA is now called a “Scientific Investigation” and must not exceed 3,000 words.

The Four Assessment Criteria

Your Chemistry IA is evaluated based on four equally weighted criteria, each worth 6 marks for a total of 24 marks:

1. Research Design – Your research question, methodology, and experimental design
2. Data Analysis – How you process and present your data
3. Conclusion – Your findings and comparison to accepted scientific context
4. Evaluation – Your critical reflection on limitations and improvements

Understanding these criteria is crucial because they guide what examiners are looking for in your investigation.

What Makes a High-Scoring Chemistry IA Topic?

Not all topics are created equal when it comes to scoring high marks. Based on examiner reports and successful student examples, high-scoring topics share these characteristics:

• Clearly defined variables – Both independent and dependent variables should be specific and measurable
• Appropriate complexity – The topic should be challenging enough for diploma-level work without being impractical
• Personal engagement – Choose something that genuinely interests you
• Feasibility – Can be completed safely with school laboratory equipment
• Rich data potential – Allows for meaningful quantitative analysis
• Clear chemistry connection – Links directly to IB Chemistry syllabus content

50 High-Scoring IB Chemistry IA Topics

Acid-Base Chemistry Topics (10 Ideas)

Acid-base investigations offer excellent opportunities for precise measurements and clear results, making them popular choices for high-scoring IAs.

1. Titration of Vitamin C Content – How does cooking temperature affect the ascorbic acid content in different vegetables as measured by iodometric titration?
2. Antacid Effectiveness Study – What is the comparative neutralization capacity of different commercial antacid brands when reacting with simulated stomach acid?
3. Coffee Acidity Analysis – How do different brewing methods (espresso, pour-over, cold brew) affect the titratable acidity of coffee?
4. Fruit Juice pH Investigation – How does storage time at room temperature affect the pH and acidity of freshly squeezed orange juice over a two-week period?
5. Buffer Capacity Comparison – What is the effect of concentration on the buffer capacity of ethanoic acid/sodium ethanoate solutions?
6. Vinegar Concentration Study – How does the heating temperature affect the concentration of ethanoic acid in commercial vinegar as determined by acid-base titration?
7. Natural Indicator Analysis – How does the pH transition range of natural indicators extracted from red cabbage compare to synthetic indicators like phenolphthalein?
8. Carbonated Drink Acidity – How does time after opening affect the acidity of different carbonated soft drinks measured through pH and titration?
9. Tea Polyphenol Content – How does brewing temperature affect the polyphenol concentration in green tea as measured by titration with potassium permanganate?
10. Milk Calcium Content – What is the calcium content of different types of milk (whole, skim, almond) as determined by EDTA complexometric titration?

Chemical Kinetics Topics (10 Ideas)

Kinetics investigations are examiner favorites because they combine mathematical analysis with practical chemistry skills.

11. Iodine Clock Reaction – How does temperature affect the rate of reaction between potassium iodide and hydrogen peroxide in the iodine clock reaction?
12. Hydrogen Peroxide Decomposition – What is the effect of manganese dioxide catalyst concentration on the rate of hydrogen peroxide decomposition?
13. Aspirin Hydrolysis – How does pH influence the rate of hydrolysis of acetylsalicylic acid (aspirin) as measured by colorimetry?
14. Magnesium and Acid Reaction – How does the concentration of hydrochloric acid affect the rate of reaction with magnesium ribbon?
15. Activation Energy Determination – What is the activation energy for the reaction between sodium thiosulfate and hydrochloric acid at different temperatures?
16. Enzyme Kinetics – How does temperature affect the activity of catalase enzyme in breaking down hydrogen peroxide?
17. Reaction Order Analysis – What is the order of reaction for the oxidation of iodide ions by persulfate ions at varying concentrations?
18. Surface Area Investigation – How does the particle size of calcium carbonate affect its reaction rate with hydrochloric acid?
19. Photochemical Reactions – How does light intensity affect the rate of photochemical degradation of dye solutions?
20. Concentration Effects – How does the concentration of sodium bicarbonate affect the neutralization reaction rate with hydrochloric acid at different temperatures?

Thermochemistry and Energetics Topics (10 Ideas)

Thermodynamics investigations allow you to explore energy changes while demonstrating calorimetry skills.

21. Alcohol Combustion Study – How does the chain length of alcohols (methanol through pentanol) affect their enthalpy of combustion?
22. Neutralization Enthalpy – What is the enthalpy change of neutralization for different strong acid-strong base combinations?
23. Salt Dissolution Investigation – How does temperature affect the enthalpy of dissolution of ammonium nitrate in water?
24. Fuel Comparison – What is the energy content of different cooking oils (olive, canola, sunflower) as measured by bomb calorimetry?
25. Hess’s Law Verification – Can Hess’s Law accurately predict the enthalpy change of formation of magnesium oxide from experimental data?
26. Isomer Energy Comparison – How does the enthalpy of combustion differ between structural isomers of butanol?
27. Heat of Hydration Study – What is the relationship between ionic radius and the enthalpy of hydration for Group 1 metal chlorides?
28. Cooling Curve Analysis – How does the concentration of salt affect the freezing point depression and cooling curve of water?
29. Hand Warmer Chemistry – What factors affect the heat released by chemical hand warmers containing different metal salts?
30. Enthalpy of Solution – How does molecular structure affect the enthalpy of solution for different carbohydrates in water?

Electrochemistry Topics (8 Ideas)

Electrochemistry topics offer unique opportunities to explore oxidation-reduction reactions and cell potentials.

31. Voltaic Cell Investigation – How does the concentration of zinc sulfate solution affect the electrode potential of a copper-zinc voltaic cell?
32. Electroplating Analysis – How does current flow affect the mass of copper deposited during the electroplating process?
33. Battery Performance Study – What factors affect the voltage output and longevity of homemade lemon batteries?
34. Corrosion Rate Investigation – How does pH affect the rate of corrosion of iron nails in different acidic solutions?
35. Nernst Equation Verification – Can the Nernst equation accurately predict cell potentials at different ion concentrations?
36. Electrolysis Efficiency – How does the concentration of sodium chloride solution affect the efficiency of chlorine gas production during electrolysis?
37. Metal Reactivity Series – How do different metal-ion combinations affect the voltage produced in galvanic cells?
38. Conductivity Study – How does the concentration of different electrolytes affect the electrical conductivity of solutions?

Organic Chemistry Topics (6 Ideas)

Organic chemistry topics allow you to explore synthesis, analysis, and properties of carbon compounds.

39. Ester Synthesis – How does the carbon chain length of alcohols affect the yield of ester formation with ethanoic acid?
40. Saponification Study – What is the effect of temperature on the rate of saponification of different vegetable oils?
41. Organic Acid Strength – How does the number of carboxyl groups affect the acid dissociation constant of organic acids?
42. Fermentation Analysis – How does temperature affect the rate of ethanol production during yeast fermentation of glucose?
43. Unsaturated Fat Content – How can iodine number analysis determine the degree of unsaturation in different cooking oils?
44. Aspirin Purity – What is the purity of synthesized aspirin from different starting materials as determined by melting point analysis?

Environmental and Applied Chemistry Topics (6 Ideas)

These topics connect chemistry to real-world environmental issues and practical applications.

45. Water Quality Analysis – How does the concentration of phosphate pollutants in different water sources compare using colorimetric analysis?
46. BOD Measurement – What is the biological oxygen demand of water samples from different local water bodies?
47. Heavy Metal Detection – How effectively do different natural adsorbents (activated charcoal, zeolite) remove lead ions from contaminated water?
48. Soil pH Investigation – How does the pH of different soil types affect the solubility and availability of iron nutrients for plants?
49. Air Pollution Study – What is the concentration of sulfur dioxide in air samples from different locations using chemical absorption methods?
50. Biodegradable Plastic Analysis – How does temperature affect the rate of decomposition of biodegradable plastic materials in compost conditions?

How to Choose Your Perfect IA Topic

With 50 options to consider, selecting the right one requires strategic thinking. Follow these steps:

Step 1: Identify Your Interests

Start by listing chemistry topics that genuinely interest you. Personal engagement is a criterion for assessment, and your enthusiasm will shine through in your writing. Consider topics related to your hobbies, career interests, or daily life.

Step 2: Assess Feasibility

Ask yourself these practical questions:

• Can I access the necessary equipment in my school laboratory?
• Are the chemicals required safe and available?
• Can I complete the investigation within the allocated 10 hours?
• Will I be able to collect sufficient data for meaningful analysis?

Step 3: Check Complexity Level

Your topic should be challenging enough to demonstrate diploma-level understanding but not so complex that it becomes unmanageable. Standard Level students might focus on simpler systems with straightforward variables, while Higher Level students can explore more advanced chemical concepts.

Step 4: Consult Your Teacher

Before finalizing your topic, discuss it with your chemistry teacher. They can provide valuable feedback on feasibility, safety concerns, and whether your research question is appropriately focused.

Crafting a Strong Research Question

Once you’ve selected a general topic area, you need to develop it into a focused research question. A strong research question includes:

• Specific independent variable – What you’re changing (e.g., temperature, concentration)
• Measurable dependent variable – What you’re measuring (e.g., pH, volume, rate)
• Clear parameters – Specific ranges and units
• Chemistry focus – Clear connection to chemical concepts

Example of a weak research question: “How does temperature affect reactions?”

Example of a strong research question: “How does temperature (ranging from 20°C to 60°C in 10°C intervals) affect the rate of reaction between 0.1M sodium thiosulfate and 0.1M hydrochloric acid, as measured by the time taken for the solution to become opaque?”

Common Pitfalls to Avoid

Even with a great topic, students can lose marks by making these common mistakes:

1. Overly Ambitious Topics

Choosing a topic that requires specialized equipment or dangerous chemicals will create unnecessary complications. Keep it simple and executable.

2. Insufficient Data Collection

Collecting too few data points or not repeating trials makes statistical analysis weak. Aim for at least 5 different values for your independent variable with multiple trials each.

3. Weak Methodology

Using imprecise equipment like beakers instead of volumetric flasks, or failing to control variables properly, undermines your results.

4. Lack of Chemical Context

Your IA must demonstrate understanding of underlying chemical principles. Don’t just collect data—explain the chemistry behind what’s happening.

5. Poor Risk Assessment

Failing to properly identify and mitigate safety risks shows lack of scientific maturity. Always include a thorough risk assessment.

Tips for Scoring High Marks

Want to maximize your IA score? Follow these expert strategies:

For Research Design (Criterion A)

• Write a crystal-clear, focused research question with specific parameters
• Justify every methodological choice you make
• Clearly identify all variables (independent, dependent, and controlled)
• Include a detailed risk assessment with safety precautions

For Data Analysis (Criterion B)

• Present data in well-organized tables with appropriate significant figures
• Create clear, properly labeled graphs that highlight trends
• Process your raw data using appropriate calculations
• Include uncertainty analysis and error propagation

For Conclusion (Criterion C)

• State your findings clearly in relation to your research question
• Compare your results to accepted scientific values or literature
• Explain any unexpected results using chemical principles
• Make justified scientific conclusions based on your data

For Evaluation (Criterion D)

• Critically analyze strengths and limitations of your investigation
• Suggest realistic, specific improvements (not just “more trials”)
• Discuss sources of systematic and random error
• Reflect on the reliability and validity of your data

Final Thoughts: Make Your IA Work for You

Your IB Chemistry IA is more than just another assignment—it’s an opportunity to explore chemistry on your own terms and demonstrate your scientific capabilities. The 50 topics provided here span the full range of chemistry subdisciplines, offering something for every interest and skill level.

Remember that these ideas are starting points for inspiration, not ready-made projects to copy. The best IAs come from students who take an idea, make it their own, and approach it with genuine curiosity and scientific rigor. Whether you’re investigating the vitamin C content of foods, exploring reaction kinetics, or analyzing electrochemical cells, your unique approach and personal engagement will set your work apart.

Start early, plan carefully, consult with your teacher regularly, and don’t be afraid to make mistakes along the way—they’re part of the scientific process. With the right topic and thorough execution, your Chemistry IA can become one of your strongest pieces of IB coursework.

Ready to begin your scientific investigation? Choose a topic that excites you, develop a focused research question, and dive into the fascinating world of chemistry research. Your high-scoring IA awaits!