2KOH + H₂SO₄ = K₂SO₄ + 2H₂O
2K⁺ + 2OH⁻+ 2H⁺ + SO₄²⁻ = 2K⁺ + SO₄²⁻ + 2H₂O
2OH⁻+ 2H⁺ = 2H₂O
2KOH + Zn(NO₃)₂ = 2KNO₃ + Zn(OH)₂↓
2K⁺ +2OH⁻ + Zn²⁺ + 2NO₃⁻ = 2K⁺ + 2NO₃⁻ + Zn(OH)₂↓
2OH⁻ + Zn²⁺ = Zn(OH)₂↓
Ba(OH)₂ + SO₂ = BaSO₃↓ + H₂O
Ba²⁺ +2OH⁻ + SO₂ = BaSO₃↓ + H₂O