WAEC GCE 2026 Chemistry Practical Questions and Answers

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Monday, 5th October, 2026
Chemistry Practical –  2pm – 3:30pm

(3ai)
Burette. A pipette can’t measure 10.50 cm³.

(3aii)
Separating funnel. Tetrachloromethane and water are immiscible.

(3b)
(i) Phenolphthalein: colourless to pink.
(ii) Methyl orange: red to orange/yellow.
If the acid is in the burette instead, the changes are reversed: pink to colourless, and yellow to orange/red.

(3c)
The solubility of NaCl changes very little with temperature. Cooling its saturated solution therefore deposits almost no crystals. The solubility of CuSO₄ falls sharply on cooling, so its crystals (CuSO₄·5H₂O) separate out.

(3d)
(i) Pipette (or burette), to measure the stock solution
(ii) Volumetric flask
(iii) Wash bottle (distilled water)

(3e)
36% HCl is more concentrated. It contains 36 g of HCl per 100 g of solution, which is more solute per unit mass than 33%.