O-LevelChemistryAcids, Bases & Salts5070/11 · May/June 2021 · Q31 Mark

Which sequence of procedures is used to separate a pure, dry sample of hydrated copper(II) sulfate, CuSO₄•5H₂O, from a mixture containing hydrated copper(II) sulfate and calcium carbonate, CaCO₃?

Adissolve in water → distillation → crystallisation

Bdissolve in water → filtration → crystallisation

Cdistillation → crystallisation → heating to remove all water

Dfractional distillation → filtration → heating to remove all water

✓ Correct answer

B: dissolve in water → filtration → crystallisation

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2021 Paper 1 Variant 1, question 3.

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