CH-53
Preparing salts
Chemistry · Secondary 3 · Medium · Preparing salts
A student wants to obtain pure dry crystals of copper(II) sulfate from excess copper(II) oxide and dilute sulfuric acid. Which final step should be carried out after filtering off the excess oxide?
- Evaporate the filtrate to complete dryness over a strong flame.
- Cool the filtrate in an ice bath immediately.
- Heat the filtrate to concentrate it, then allow it to cool and crystallise.
- Add more copper(II) oxide until no more dissolves, then filter again.
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