Make all the possible equations for the reactions of obtaining salts: copper chloride 2 barium sulfate, potassium carbonate.

1. Obtaining copper chloride:
Cu + Cl2 = CuCl2;
CuO + 2HCl = CuCl2 + H2O;
Cu (OH) 2 + 2HCl = CuCl2 + H2O;
CuCO3 + 2HCl = CuCl2 + CO2 + H2O;
CuS + Cl2 = CuCl2 + S;
3Cu + 2HNO3 + 6HCl = 3CuCl2 + 2NO + 4H2O;
2. Obtaining barium sulfate:
BaS + H2O = BaSO4;
BaO + H2SO4 = BaSO4 + H2O;
Ba (OH) 2 + H2SO4 = BaSO4 + 2H2O;
BaCl2 + H2SO4 = BaSO4 + 2HCl;
ZnSO4 + BaS = BaSO4 + ZnS
3. Obtaining potassium carbonate:
K2O + CO2 = K2CO3;
2KOH + CO2 = K2CO3 + H2O
Potassium carbonate is used to make liquid soap.