CH-60
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. After warming and filtering the mixture, what is the next step?
- Cool the filtrate in an ice bath immediately
- Add more copper(II) oxide until no more dissolves
- Evaporate the filtrate to concentrate it, then allow to cool
- Add sodium chloride solution to precipitate the crystals
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