WAEC Chemistry 2015 Theory — Question 47

Question 47 of 49 from the West African Examinations Council (WAEC) Chemistry 2015 Theory paper, with the correct answer and a full explanation.

5(c)(ii). Explain briefly a test to confirm the purity of water.

Model answer

The water should be boiled, and the boiling point should be noted using a thermometer. If it boils at exactly 100°C, the water sample is pure; if otherwise (boiling point differs from 100°C), it is impure.

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