So breaking down the question. A Salt is the resulting ionic compound from a neutralisation reaction an acid and a base. In the case of Copper Oxide, this is the base. So to make a salt with copper oxide you must have it react with an acid. read more
A Salt is the resulting ionic compound from a neutralisation reaction an acid and a base. In the case of Copper Oxide, this is the base. So to make a salt with copper oxide you must have it react with an acid. For Copper Oxide to form a salt, the bonds between Copper and Oxygen need to be broken and this will require energy. read more
Copper oxide, and other transition metal oxides or hydroxides, do not dissolve in water. If the base does not dissolve in water, you need an extra step. You add the base to the acid until no more will dissolve and you have some base left over (called an excess). read more
If you do this the slow way (which is safest and can get you some awesome crystals) then you want a lot of copper oxide suspended in water, and add some sulphuric acid but not enough to react all the copper oxide. read more