Yes, copper nitrate is soluble in water.
Water is an inorganic compound that consists of the chemical formula H2O, which stands for Hydrogen and O2 (Oxygen). It is transparent, tasteless, odorless, and nearly colorless, and it is the main constituent of Earth’s hydrosphere and the fluids of all living organisms.
Nitrate salts of most metallic elements are soluble in water; however, some are more soluble than others. Solubility depends on the metal cation and the number of nitrate radicals in the compounds.
Solubility of copper nitrate in water and in methanol
As with most nitrate salts, the solubility of copper nitrate in a liquid is dependent on the nitrate anions (copper(2+) and nitrate), as well as the copper(II) ions. In addition, the acidity of the solution is a factor in solubility.
The solubility of nitrate salts is also dependent on the presence of other metal cations. Solubility is also affected by the temperature, and the nitrate salts of some elements such as zinc are less soluble in cold water than other nitrate salts.
To obtain a solution of copper nitrate, dissolve 3 g of powdered solid copper in 10 mL of deionized water in a beaker. Transfer the solution to a hotplate and allow it to react for 10 min. The copper will oxidize to form the salt copper nitrate and water, as well as the gas NO2 from the nitric acid reaction. The nitrate anions will be reduced to copper oxide and the solution will begin to change from reddish-brown to clear and colorless.