Chemistry · May / June 2021 · Paper 11 · Question 3
5070Separation and purification
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
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Correct answer: B. dissolve in water → filtration → crystallisation
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