The WAEC 2026 Chemistry Practical Alternative B examination is one of the most important science papers for candidates sitting for the West African Senior School Certificate Examination (WASSCE). Many students find Alternative B easier than the conventional practical because it focuses on interpreting experimental procedures, analyzing observations, performing calculations, and answering chemistry practical questions without conducting actual laboratory experiments.
In this guide, we will explain everything you need to know about the WAEC 2026 Chemistry Practical Alternative B paper, including the exam format, likely questions, specimen requirements, and sample answers to help you prepare effectively.
What is WAEC Chemistry Practical Alternative B?
WAEC Chemistry Practical Alternative B is designed for candidates who may not have access to a fully equipped laboratory. Instead of carrying out practical experiments physically, candidates are required to answer questions based on provided diagrams, observations, apparatus, and experimental data.
The examination tests candidates’ understanding of:
- Qualitative analysis
- Quantitative analysis
- Chemical calculations
- Laboratory apparatus
- Observation and inference
- Scientific reasoning
WAEC 2026 Chemistry Practical Alternative B Specimen
According to available specimen information, candidates may be provided with common laboratory reagents and apparatus used for qualitative analysis. These typically include:
- Red and blue litmus paper
- Aqueous ammonia
- Dilute hydrochloric acid
- Dilute sodium hydroxide solution
- Barium chloride solution
- Dilute trioxonitrate (V) acid
- Silver trioxonitrate (V) solution
- Burette
- Pipette
- Titration apparatus
- Filtration apparatus
Students should familiarize themselves with the functions of these reagents and the reactions they produce.
Areas WAEC Frequently Tests in Alternative B
1. Qualitative Analysis
This section requires candidates to identify ions, gases, or compounds through observations and inferences.
Examples include:
| Observation | Inference |
|---|---|
| White precipitate with NaOH | Presence of Zn²⁺, Al³⁺, or Pb²⁺ |
| Effervescence with acid | Carbonate present |
| White precipitate with AgNO₃ | Chloride ion present |
| White precipitate with BaCl₂ | Sulphate ion present |
2. Volumetric Analysis
Candidates may be required to:
- Read burette values
- Calculate titre values
- Determine concentration
- Calculate molar ratios
3. Chemical Calculations
Common calculations include:
- Number of moles
- Molar concentration
- Percentage purity
- Empirical formula
- Relative molecular mass
4. Observation and Inference
WAEC often awards marks separately for observations and inferences. Candidates should therefore write exactly what they observe before stating conclusions.
Likely WAEC 2026 Chemistry Practical Alternative B Questions
Question 1
A white solid reacts with dilute hydrochloric acid producing a colorless gas that turns limewater milky.
Observation
- Effervescence occurs.
- Colorless gas is evolved.
- Limewater turns milky.
Inference
- Carbon dioxide gas is present.
- Carbonate ion is present.
Question 2
A solution gives a white precipitate with barium chloride solution which remains insoluble in dilute hydrochloric acid.
Observation
- White precipitate forms.
- Precipitate remains insoluble.
Inference
- Sulphate ion (SO₄²⁻) is present.
Question 3
A salt dissolves in water and produces a blue solution.
Observation
- Blue-colored solution obtained.
Inference
- Copper (II) ion is present.
Sample Alternative B Answers
Test for Chloride Ion
Procedure
Add dilute nitric acid followed by silver trioxonitrate (V) solution.
Observation
White precipitate forms.
Inference
Chloride ion is present.
Test for Sulphate Ion
Procedure
Add dilute hydrochloric acid and barium chloride solution.
Observation
White precipitate forms and remains insoluble.
Inference
Sulphate ion is present.
Test for Ammonium Ion
Procedure
Warm with sodium hydroxide solution.
Observation
Colorless gas evolved which turns moist red litmus paper blue.
Inference
Ammonia gas present; ammonium ion detected.
Common Chemistry Practical Apparatus and Their Uses
| Apparatus | Use |
|---|---|
| Burette | Accurate measurement of liquid volume |
| Pipette | Transfer fixed volume of solution |
| Conical Flask | Titration reactions |
| Beaker | Holding solutions |
| Funnel | Filtration |
| Test Tube | Chemical tests |
| Measuring Cylinder | Measuring liquid volume |
Tips to Pass WAEC Chemistry Alternative B
- Study past practical questions regularly.
- Master common laboratory reagents and their uses.
- Learn all observation and inference patterns.
- Practice titration calculations.
- Understand tests for gases and ions.
- Memorize common colors of ions and precipitates.
- Read every question carefully before answering.
- Always separate observations from inferences.
Important Notice to Candidates
The West African Examinations Council has not officially released the 2026 Chemistry Practical Alternative B questions. Candidates should avoid websites or individuals claiming to possess leaked examination materials. Instead, focus on understanding the specimen, practical procedures, and past questions to improve your chances of success. Official specimen information for 2026 indicates a focus on qualitative analysis reagents, titration apparatus, and standard laboratory procedures.
Conclusion
WAEC 2026 Chemistry Practical Alternative B is designed to assess a candidate’s practical chemistry knowledge through theoretical and analytical questions. By mastering qualitative analysis, titration principles, laboratory apparatus, and chemical calculations, candidates can score excellent grades in the examination.
Consistent practice with past questions, proper understanding of observations and inferences, and familiarity with laboratory reagents remain the best strategies for success in WAEC Chemistry Practical Alternative B 2026.
