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А.
Na₂SO₃ + H₂SO₄ = Na₂SO₄ + SO₂↑ + H₂O
2Na⁺ + SO₃²⁻ + 2H⁺ + SO₄²⁻ = 2Na⁺ + SO₄²⁻ + SO₂↑ + H₂O
SO₃²⁻ + 2H⁺ = SO₂↑+ H₂O
Б.
CH₃COOH + KOH = CH₃COOK + H₂O
CH₃COOH + K⁺ + OH⁻ = CH₃COO⁻ + K⁺ + H₂O
CH₃COOH + OH⁻ = CH₃COO⁻ + H₂O
В.
Na₂HPO₄ + NaOH = Na₃PO₄ + H₂O
2Na⁺ + HPO₄²⁻ + Na⁺ + OH⁻ = 3Na⁺ + PO₄³⁻ + H₂O
HPO₄²⁻ + OH⁻ = PO₄³⁻ + H₂O
Г.
Be(OH)₂ + 2KOH = K₂[Be(OH)₄]
Вe(OH)₂ + 2K⁺ + 2OH⁻ = 2K⁺ + [Be(OH)₄]²⁻
Вe(OH)₂ + 2OH⁻ = [Be(OH)₄]²⁻