Question
Question 5 (5 marks)
Describe how you would prepare a pure, dry sample of copper sulfate crystals by reacting copper oxide with dilute sulfuric acid.
Mark scheme (B1, 5 marks):
- Add excess copper oxide (black solid) to dilute sulfuric acid in a beaker; warm gently (1 mark)
- The copper oxide reacts: CuO + H₂SO₄ → CuSO₄ + H₂O (1 mark)
- Filter the mixture to remove excess unreacted copper oxide (1 mark)
- Evaporate the blue filtrate (copper sulfate solution) to concentrate it; allow to cool to crystallise (1 mark)
- Filter the crystals; dry on filter paper or in a low-temperature oven (1 mark)
5 marks · take your time before peeking.
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Generated by TopMyGrade AI · cross-check official sources before relying on the mark-scheme phrasing.