CH-59
Preparing salts
Chemistry · Secondary 3 · Medium · Preparing salts
A student wants to prepare pure, dry crystals of copper(II) sulfate from dilute sulfuric acid and copper(II) oxide. Which final step should she carry out after filtering off the excess copper(II) oxide and obtaining a clear solution?
- Add more copper(II) oxide until no more dissolves.
- Evaporate all the water to dryness over a strong flame.
- Heat the solution to concentrate it, then allow it to cool to form crystals.
- Add distilled water to dilute the solution before crystallisation.
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