The formula for copper II dihydrogen phosphate is Cu(H2PO4)2.
In this formula, Cu represents copper, which has a +2 oxidation state in this compound. The (H2PO4) part corresponds to the dihydrogen phosphate ion. Each dihydrogen phosphate ion (H2PO4–) contributes two protons (H+) making it dihydrogen. There are two dihydrogen phosphate ions in the formula, which balances the +2 charge of the copper ion. Hence, the complete chemical formula for copper II dihydrogen phosphate is derived by combining one copper ion with two dihydrogen phosphate ions.