Copper is insoluble in water.
Copper(II) oxide is a solid that is insoluble in water but reacts with dilute hydrochloric acid.
Which method is used to separate copper from a mixture of copper and copper(II) oxide?
1 )
dissolve the mixture in water then filter
2 )
dissolve the mixture in water then crystallise
react the mixture with dilute hydrochloric acid then filter
4 )
react the mixture with dilute hydrochloric acid then crystallise
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