1. FeCl₃ + 3NaOH → Fe(OH)₃ + 3NaCl
2. 2Fe(OH)₃ → Fe₂O₃ + H₂O
3. Fe₂O₃ + 6HCl → 2FeCl₃ + 3H₂O
1. FeCl₂ + 2NaOH → Fe(OH)₂ ↓ + 2NaCl
2. Fe(OH)₂ →t°C FeO + H₂O
3. 2FeO + 4H₂SO₄(конц.) → Fe₂(SO₄)₃ + 4H₂O + SO₂
1. FeCl₃ + 3NaOH → Fe(OH)₃ + 3NaCl
2. 2Fe(OH)₃ → Fe₂O₃ + H₂O
3. Fe₂O₃ + 6HCl → 2FeCl₃ + 3H₂O
1. FeCl₂ + 2NaOH → Fe(OH)₂ ↓ + 2NaCl
2. Fe(OH)₂ →t°C FeO + H₂O
3. 2FeO + 4H₂SO₄(конц.) → Fe₂(SO₄)₃ + 4H₂O + SO₂