Question

What occurs when copper(II) oxide is treated with sulfuric acid?

Answer 1

The oxide should go up into solution to give a beautiful blue colour.

Explanation:

`CuO(s) + H_2SO_4(aq) rarr Cu^(2+) + SO_4^(2-) + H_2O`

The `Cu^(2+)` ion in water (probably `Cu(OH_2)_6^(2+)`) gives a truly beautiful blue colour, from which large macroscopic crystals can be obtained.