CH-20
Preparing salts
Chemistry · Secondary 3 · Medium · Preparing salts
A student wants to obtain pure dry crystals of copper(II) sulfate from a mixture of excess copper(II) oxide and dilute sulfuric acid. Which final step should be carried out after filtering off the excess oxide?
- Add more copper(II) oxide until no more dissolves.
- Evaporate the filtrate to concentrate it and allow crystals to form.
- Add sodium chloride to precipitate copper(II) sulfate.
- Cool the mixture before filtering off the excess oxide.
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