HCl + KOH = KCl + H₂O
H⁺ + Cl⁻ + K⁺ + OH⁻ = K⁺ + Cl⁻ + H₂O
H⁺ + OH⁻ =H₂O
FeSO₄ + 2KOH = Fe(OH)₂ + K₂SO₄
Fe²⁺ + SO₄²⁻ + 2K⁺ + 2OH⁻ = Fe(OH)₂ + 2K⁺ + SO₄²⁻
Fe²⁺ + 2OH⁻ = Fe(OH)₂
Zn + 2HCl = ZnCl₂ + H₂
Zn + 2H⁺ + 2Cl⁻ = Zn²⁺ + 2Cl⁻ + H₂
Zn + 2H⁺ += Zn²⁺ + H₂
Zn + 2KOH = K₂ZnO₂ + H₂
Zn + 2K⁺ + 2OH⁻ = 2K⁺ + ZnO₂²⁻ + H₂
Zn + 2OH⁻ = ZnO₂²⁻ + H₂
SO₂ + 2KOH = K₂SO₃ + H₂O
SO₂ + 2K⁺ + 2OH ⁻ = 2K⁺ + SO₃²⁻ + H₂O
SO₂ + 2OH ⁻ = SO₃²⁻ + H₂O