Which method is used to prepare a sample of calcium sulfate from calcium chloride solution?

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Question

Which method is used to prepare a sample of calcium sulfate from calcium chloride solution?

Accepted Answer

Precipitation using sodium sulfate solution — Award 1 mark for precipitation. Calcium sulfate is slightly soluble/insoluble and can be prepared by mixing calcium chloride solution with sodium sulfate solution. A is incorrect because calcium sulfate would precipitate during titration, making endpoint detection impossible. B is incorrect because adding calcium metal would not produce calcium sulfate. D is incorrect because electrolysis would produce calcium and chlorine, not calcium sulfate.

Answer

Reaction with excess calcium metal

Answer

Electrolysis of calcium chloride solution

Answer

Precipitation using sodium sulfate solution

Answer

Titration with dilute sulfuric acid

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