2HCl + Pb(NO₃)₂ = 2HNO₃ + PbCl₂↓
2H⁺ + 2Cl⁻ + Pb²⁺ + 2NO₃⁻ = 2H⁺ + 2NO₃⁻ + PbCl₂↓
2Cl⁻ + Pb²⁺= PbCl₂↓
2HCl + CaO = CaCl₂ + H₂O
2H⁺ + 2Cl⁻ + CaO = Ca²⁺ + 2Cl⁻ + H₂O
2H⁺ + CaO = Ca²⁺ + H₂O
3HCl + Fe(OH)₃ = FeCl₃ + 3H₂O
3H⁺ + 3Cl⁻ + Fe(OH)₃ = Fe³⁺ + 3Cl⁻ + 3H₂O
3H⁺ + Fe(OH)₃ = Fe³⁺ + 3H₂O