Make up the chemical reactions FeSO4 – Fe (OH) 2 – FeCl2, CuSO4 – Cu (OH) 2 – Cu (NO3) 2

1 chain:

1) FeSO4 + 2NaOH = Fe (OH) 2 + Na2SO4 (when iron sulfate interacts with sodium hydroxide, iron hydroxide and sodium sulfate are formed);

2) Fe (OH) 2 + HCl = FeCl2 + 2H2O (when iron hydroxide interacts with hydrochloric acid, ferric chloride and water are formed).

2 chain:

1) CuSO4 + 2KOH = Cu (OH) 2 + K2SO4 (when copper sulfate interacts with potassium hydroxide, copper hydroxide and potassium sulfate are formed);

2) Cu (OH) 2 + 2HNO3 = Cu (NO3) 2 + 2H2O (when copper hydroxide interacts with nitric acid, copper nitrate and water are formed).