WAEC 2026 Chemistry Practical ALT B Questions and Answers

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Tuesday, 9th June 2026
Chemistry Practical –  9:30am – 11:30am (1st Set)

(2a)

Test: F + 10 cm³ distilled water, filter.

Test filtrate with litmus

 

Observation: Dissolves partially. Filtrate turns red litmus blue / blue litmus stays blue

 

Inference: Solution is alkaline; presence of alkaline salt e.g. Na₂SO₄ or similar

 

(2bi)

Test: Filtrate + zinc dust

 

Observation: Effervescence / bubbles produced; colourless gas

 

Inference: Possible reduction reaction; H₂ gas evolved

 

(2bii)

Test: Filtrate + NH₃(aq) in drops then excess

 

Observation: White precipitate forms, dissolves in excess

 

Inference: Cu²⁺ ions present. Forms deep blue complex in excess

 

(2biii)

Test: Filtrate + BaCl₂(aq) + dilute HCl

 

Observation: White precipitate insoluble in HCl

 

Inference: SO₄²⁻ ions present

 

(2ci)

Test: Residue + 3 cm³ distilled water, boil

 

Observation: Residue partially dissolves, forms a paste/suspension

 

Inference: Insoluble carbohydrate starch present

 

(2cii)

Test: Mixture from (c)(i) + iodine solution

 

Observation: Blue-black colouration

Inference: Starch confirmed

 

Conclusion:

(i)The inorganic salt is CuSO₄ copper(II) tetraoxosulphate

(ii)The carbohydrate is starch

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(3ai)
Burette readings are taken at eye level to avoid parallax error and obtain an accurate reading of the meniscus.

(3aii)
The funnel is removed before taking the initial burette reading to prevent any drops of solution remaining in the funnel from entering the burette and changing the volume.

(3aiii)
The burette is rinsed with the acid solution to remove water or impurities that may dilute the acid and affect the concentration.

(3b)
(PICK ANY THREE)
(i) Volumetric flask
(ii) Beaker
(iii) Funnel
(iv) Weighing balance
(v) Spatula
(vi) Glass stirring rod