1) Al₂(SO₄)₃ + 2Na₃PO₄ = 3Na₂SO₄ + 2AlPO₄↓.
2Al³⁺ + 3SO₄²⁻ + 6Na⁺ + 2PO₄³⁻ = 6Na⁺ + 3SO₄²⁻ + 2AlPO₃↓.
Al³⁺ + PO₄³⁻ = AlPO₄↓.
2) K₂SiO₃ + BaCl₂ = 2KCl + BaSiO₃↓.
2K⁺ + SiO₃²⁻ + Ba²⁺ + 2Cl⁻ = 2K⁺ + 2Cl⁻ + BaSiO₃↓.
SiO₃²⁻ + Ba²⁺ = BaSiO₃↓.
3) ZnI₂ + Na₂S = ZnS↓ + 2NaI.
Zn²⁺ + 2I⁻ + 2Na⁺ + S²⁻ = ZnS↓ + 2Na⁺ + 2I⁻.
Zn²⁺ + S²⁻ = ZnS↓.
4) 3HCl + Al(OH)₃ = AlCl₃ + 3H₂O.
3H⁺ + 3Cl⁻ + Al(OH)₃ = Al³⁺ + 3Cl⁻ + 3H₂O.
3H⁺ + Al(OH)₃ = Al³⁺ + 3H₂O.
5) K₂SiO₃ + 2HNO₃ = H₂SiO₃↓ + 2KNO₃.
2K⁺ + SiO₃²⁻ + 2H⁺ + 2NO₃⁻ = H₂SiO₃↓ + 2K⁺ + 2NO₃⁻.
SiO₃²⁻ + 2H⁺ = H₂SiO₃↓.