Copper(II) nitrate is a chemical compound with the formula Cu(NO3)2. It consists of one copper ion with a +2 charge and two nitrate ions. This blue crystalline solid is soluble in water and is often used in laboratories and industrial applications, such as in the production of other copper compounds and as a catalyst. In its hydrated form, copper(II) nitrate appears as blue crystals, commonly known as copper(II) nitrate trihydrate (Cu(NO3)2·3H2O). It can be produced by reacting copper oxide or copper carbonate with nitric acid. Due to its properties, it is also used in the field of chemistry for various experiments and reactions.