Al³⁺ + 3Cl⁻ + 3Na⁺ +3OH⁻ = 3Na⁺ + 3Cl⁻ + Al(OH)₃
Al³⁺ +3OH⁻ = Al(OH)₃
2. 2 Al(OH)₃ + 3 H₂SO₄ = Al₂(SO₄)₃ + 6H₂O