Write the reaction equation: Cu – CuO – CuCl2 – Cu (OH) 2 – CuO – Cu

To carry out the above chain of transformations, it is necessary to carry out the following two reactions:

The reaction of copper and oxygen, as a result of the reaction, copper oxide is formed. The chemical equation for the reaction is as follows:

2 Cu + O2 = 2 CuO

The reaction between copper oxide and hydrochloric acid, as a result of the reaction, a copper chloride salt is formed and water is released. The chemical equation for the reaction is as follows:

CuO + 2 HCl = CuCl2 + H2O

Copper chloride react with sodium hydroxide, as a result of the reaction, copper hydroxide and sodium chloride salt are formed. The chemical equation for the reaction is as follows:

CuCl2 + 2 NaOH = Cu (OH) 2 + 2 NaCl

The decomposition reaction of copper hydroxide, as a result of the reaction, copper oxide is formed and water is released. The chemical equation for the reaction is as follows:

Cu (OH) = CuO + H2O

The reaction between copper oxide and hydrogen as a result of the reaction, copper is formed and water is released. The chemical equation for the reaction is as follows:

CuO + H2 = Cu + H2O.