CH-91
Preparing salts
Chemistry · Secondary 3 · Medium · Preparing salts
A student adds excess copper(II) oxide to warm dilute sulfuric acid and then filters the mixture to obtain a blue solution. To obtain pure dry copper(II) sulfate crystals, what should the student do next?
- Boil the solution to complete dryness, then cool.
- Cool the solution in an ice bath immediately.
- Heat the solution to concentrate it, then allow it to cool slowly.
- Add more copper(II) oxide until no more dissolves, then cool.
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