I’m sorry, but there is no chemical substance with the formula Cu(OH)4. You may have made a mistake. The chemical formula for Copper (II) Hydroxide is Cu(OH)2. This substance is a hydroxide salt of copper that appears as a green crystalline solid, odorless. It is commonly used in water treatment, as an additive in cultivation, and in many other applications. Its molecular structure consists of one copper II ion and two hydroxide ions.