а) NaOH + HCl = NaCl + H₂O;
Na⁺ + OH⁻ + H⁺ + Cl⁻ = Na⁺ + Cl⁻ + H₂O;
OH⁻ + H⁺ = H₂O.
KOH + HNO₃ = KNO₃ + H₂O;
K⁺ + OH⁻ + H⁺ + NO₃⁻ = K⁺ + NO₃⁻ + H₂O;
OH⁻ + H⁺ = H₂O.
б) KCl + AgNO₃ = KNO₃ + AgCl↓;
K⁺ + Cl⁻ + Ag⁺ + NO₃⁻ = K⁺ + NO₃⁻ + AgCl↓;
Cl⁻ + Ag⁺ = AgCl↓.
NaCl + AgNO₃ = NaNO₃ + AgCl↓;
Na⁺ + Cl⁻ + Ag⁺ + NO₃⁻ = Na⁺ + NO₃⁻ + AgCl↓;
Cl⁻ + Ag⁺ = AgCl↓.
в) MgSO₄ + Ba(Br)₂ = Mg(Br)₂ + BaSO₄↓;
Mg⁺² + SO₄²⁻ + Ba⁺² + 2Br⁻ = Mg⁺² + 2Br⁻ + BaSO₄↓;
SO₄²⁻ + Ba⁺² = BaSO₄↓.
ZnSO₄ + Ba(NO₃)₂ = Zn(NO₃)₂ + BaSO₄↓;
Zn⁺² + SO₄²⁻ + Ba⁺² + 2NO₃⁻ = Zn⁺² + 2NO₃⁻ + BaSO₄↓;
SO₄²⁻ + Ba⁺² = BaSO₄↓.