Write the reaction equation: CuO- CuCl₂ – Cu (OH) ₂- CuO2) Mg- MGo- MgCL₂- Mg (OH) ₂

a) 1) To obtain copper chloride from copper oxide, it is necessary to add hydrochloric acid to the oxide:

CuO + 2HCl → CuCl2 + H2O;

2) As a result of the exchange reaction of copper chloride and sodium hydroxide, we get – sodium chloride and copper hydroxide (II):

CuCl2 + 2NaOH → 2NaCl + Cu (OH) 2 ↓;

3) When heated, copper (II) hydroxide decomposes into copper (II) oxide and water:

Cu (OH) 2 ↓ → CuO + H2O.

b) 1) Magnesium reacts with oxygen, and we get – magnesium oxide:

2Mg + O2 → 2MgO;

2) To obtain magnesium chloride from its oxide, it is necessary to add hydrochloric acid to the oxide:

MgO + 2HCl → MgCl2 + H2O;

3) Magnesium chloride reacts with sodium hydroxide and forms – magnesium hydroxide and sodium chloride:

MgCl2 + NaOH → Mg (OH) 2 + NaCl.