O Levels Chemistry (5070)•5070/11/M/J/20
Explanation
Crystallization process for copper(II) sulfate requires filtration and evaporation
Steps:
- React copper(II) oxide with dilute sulfuric acid to form the solution.
- Filter the mixture to remove unreacted solids.
- Evaporate the filtrate in an open dish to concentrate the solution.
- Cool the concentrated solution to form pure crystals.
Why C is correct:
- Option C (2 and 3) corresponds to the evaporating dish for concentration and filter funnel for separating impurities, essential for crystal formation per solubility principles.
Why the others are wrong:
- A (1 and 2): Beaker (1) holds the reaction but lacks filtration needed to purify.
- B (1 and 4): Spatula (4) stirs but omits evaporation for supersaturation.
- D (3 and 4): Filter (3) purifies but without evaporation, no crystal formation occurs.
Final answer: C
Topic: Preparation of salts
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