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₁ ₂ ₃ ₄
ZnSO₄ → Zn(OH)₂ → ZnCl₂ → AlCl₃ → Al(OH)₃
1. 2NaOH + ZnSO₄ = Na₂SO₄ + Zn(OH)₂↓
2Na⁺ + 2OH⁻ + Zn²⁺ + SO₄²⁻ = 2Na⁺ + SO₄²⁻ + Zn(OH)₂↓
Zn²⁺ + 2OH⁻ = Zn(OH)₂↓
2. Zn(OH)₂ + 2HCl = ZnCl₂ + 2H₂O
Zn(OH)₂ + 2H⁺ + Cl⁻ = Zn2+ + 2Cl⁺ + 2H₂O
Zn(OH)₂ + 2H⁺ = Zn2+ + 2H₂O
3. 2Al + 3ZnCl₂ = 2AlCl₃ + 3Zn
2Al° + 3Zn²⁺ + 6Cl⁻ = 2Al³⁺ + 6Cl⁻ + 3Zn°
2Al° + 3Zn²⁺ = 2Al³⁺ + 3Zn°
4, AlCl₃ + 3NaOH = 3NaCl + Al(OH)₃↓
Al³⁺ + 3Cl⁻ + 3Na⁺ +3OH⁻ = 3Na⁺ + 3Cl⁻ + Al(OH)₃↓
Al³⁺+ 3OH(-) = Al(OH)₃↓