Part D

The black cupric oxide solid undergoes an acid-base neutralization reaction with aqueous hydrochloric acid to form a green cupric chloride salt solution, and water.

CuO + 2HCl -> CuCl2 + H2O

Here, the black cupric oxide solution was vacumed to extract all of the water and isolate the cupric oxide.

When this was done, HCl was added to the Cupric oxide to create a cupric chloride salt solution.