AlCl₃ + 3KOH = Al(OH)₃↓ + 3KCl;
Al⁺³ + 3Cl⁻ + 3K⁺ + 3OH⁻ = Al(OH)₃↓ + 3K⁺ + 3Cl⁻;
Al⁺³ + 3OH⁻ = Al(OH)₃.
KOH + HNO₃ = KNO₃ + H₂O;
K⁺ + OH⁻ + H⁺ + NO₃⁻ = K⁺ + NO₃⁻ + H₂O;
OH⁻ + H⁺ = H₂O.
BaBr₂ + H₂SO₄ = BaSO₄↓ + 2HBr;
Ba⁺² + 2Br⁻ + 2H⁺ + SO₄²⁻ = BaSO₄↓ + 2H⁺ + 2Br⁻;
Ba⁺² + SO₄²⁻ = BaSO₄↓.