Original: It can be made by the action of sulfuric acid on a variety of copper ( II ) compounds , for example copper ( II ) oxide ; this oxide can be generated with the addition of hydrogen peroxide to the acid . It may also be prepared by electrolyzing sulfuric acid , using copper electrodes .
Simplified: It can also be made by reacting copper ( II ) oxide or copper ( II ) hydroxide or copper ( II ) carbonate with sulfuric acid .