CH-24
Preparing salts
Chemistry · Secondary 3 · Medium · Preparing salts
A student wants to prepare pure crystals of copper(II) sulfate by reacting copper(II) oxide with dilute sulfuric acid. Which pair of steps will correctly obtain the crystals?
- Add limited copper(II) oxide, filter, evaporate to dryness.
- Add excess acid, filter, cool the filtrate without heating.
- Add excess copper(II) oxide, filter, warm the filtrate to concentrate and allow to cool.
- Add excess copper(II) oxide, evaporate mixture to dryness directly.
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