2026 WAEC Chemistry 3 Practical Questions and Answers (Alternative B)
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WAEC 2026 Chemistry 3 Practical Alternative B — Question Paper
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WAEC 2026 Chemistry Practical Alternative B — Answers
Question 2 — Identification of Inorganic Salt and Carbohydrate
| Test | Observation | Inference |
|---|---|---|
| (2a) F + 10 cm³ distilled water, filter. Test filtrate with litmus. | Dissolves partially. Filtrate turns red litmus blue / blue litmus stays blue. | Solution is alkaline; presence of alkaline salt e.g. Na2SO4 or similar. |
| (2b)(i) Filtrate + zinc dust. | Effervescence / bubbles produced; colourless gas. | Possible reduction reaction; H2 gas evolved. |
| (2b)(ii) Filtrate + NH3(aq) in drops then excess. | White precipitate forms, dissolves in excess. | Cu2+ ions present. Forms deep blue complex in excess. |
| (2b)(iii) Filtrate + BaCl2(aq) + dilute HCl. | White precipitate insoluble in HCl. | SO42− ions present. |
| (2c)(i) Residue + 3 cm³ distilled water, boil. | Residue partially dissolves, forms a paste/suspension. | Insoluble carbohydrate/starch present. |
| (2c)(ii) Mixture from (c)(i) + iodine solution. | Blue-black colouration. | Starch confirmed. |
Conclusion: (i) The inorganic salt is CuSO4 (copper(II) tetraoxosulphate(VI)). (ii) The carbohydrate is starch.
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