Na₂CO₃ + BaCl₂ = BaCO₃↓ + 2NaCl;
2Na⁺ + CO₃²⁻ + Ba²⁺ + 2Cl⁻ = BaCO₃↓ + 2Na⁺ + 2Cl⁻;
CO₃²⁻ + Ba²⁺ = BaCO₃↓.
FeS + 2HCl = H₂S + FeCl₂;
FeS + 2H⁺ + 2Cl⁻ = 2H⁺ + S²⁻ + Fe²⁺ + 2Cl⁻;
FeS = S²⁻ + Fe²⁺.
2Na₃PO₄ + 3MnCl₂ = Mn₃(PO₄)₂↓ + 6NaCl;
6Na⁺ + 2PO₄³⁻ + 3Mn²⁺ + 6Cl⁻ = Mn₃(PO₄)₂↓ + 6Na⁺ + 6Cl⁻;
2PO₄³⁻ + 3Mn²⁺ = Mn₃(PO₄)₂↓.