2Fe + 3Cl2 = 2FeCl3
FeCl3 + 3NaOH = Fe(OH)3↓ + 3NaCl
Fe³⁺ + 3Cl⁻ + 3Na⁺ + 3OH⁻ = Fe(OH)₃↓ + 3Na⁺ + 3Cl⁻
Fe³⁺ + 3OH⁻ = Fe(OH)₃↓
2Fe(OH)3 =t=> Fe2O3 + 3H2O
Fe₂O₃ + 3H₂SO₄ = Fe₂(SO₄)₃ + 3H₂O
Fe₂O₃ + 6H⁺ + 3SO₄²⁻ = 2Fe³⁺ + 3SO₄²⁻ + 3H₂O
Fe₂O₃ + 6H⁺ = 2Fe³⁺ + 3H₂O