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1. 2KOH + H₂SO₄ = K₂SO₄ + 2H₂O
2K⁺ + 2OH⁻ + 2H⁺ + SO₄²⁻ = 2K⁺ + SO₄²⁻ + 2H₂O
2H⁺ + 2OH⁻ = 2H₂O
2. Ba(OH)₂ + SO₂ = BaSO₃ + H₂O
Ba²⁺ + 2OH⁻ + SO₂ = BaSO₃ + H₂O
3. Ni(OH)₂ + SO₃ = NiSO₄ + H₂O
Ni²⁺ + 2OH⁻ + SO₃ = NiSO₄ + H₂O
4, Fe(OH)₂ + 2HCI = FeCI₂ + 2Н₂О
Fe(OH)₂ + 2H⁺ + 2CI⁻ = Fe²⁺ + 2CI⁻ + 2Н₂О
Fe(OH)₂ + 2H⁺ = Fe²⁺ + 2Н₂О