CH-6
Preparing salts
Chemistry · Secondary 3 · Medium · Preparing salts
A student wants to prepare pure crystals of copper(II) sulfate by reacting excess copper(II) oxide with dilute sulfuric acid. After filtering off the excess copper(II) oxide, what should the student do next to obtain the crystals?
- Cool the filtrate immediately to form crystals.
- Evaporate the filtrate to dryness and scrape off the solid.
- Heat the filtrate to concentrate it, then allow it to cool to crystallise.
- Add more copper(II) oxide until no more dissolves, then filter again.
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