Make copper carbonate (2) from copper nitrate (2).

Copper carbonate cannot be obtained directly by exchange reactions in aqueous solutions between Cu (II) salts and soluble carbonates of other metals. Due to strong hydrolysis, hydroxycarbonates (basic carbonates) of the following compositions are released: CuCO3 Cu (OH) 2 and 2CuCO3 Cu (OH) 2, depending on temperature and reagent concentrations:

2Cu (NO3) 2 + 2Na2CO3 + H2O = CaCO3 Cu (OH) 2 + 4 NaN

Normal copper carbonate CuCO3 is obtained by treating basic carbonates with carbon dioxide under a pressure of 4.6 MPa at 180 ° C:

CaCO3 Cu (OH) 2 + CO2 = 2CuCO3 + H2O.