2NaOH+H2SO4=Na2SO4+2H2O
2Na⁺ + 2OH⁻ + 2H⁺ + SO₄²⁻ = 2Na⁺ + SO₄²⁻ + 2H2O
2OH⁻ + 2H⁺ =2H2O
Mg(OH)2+2HNO3=Mg(NO3)2+2H2O
Mg²⁺ + 2OH⁻ + 2H⁺ + 2NO₃⁻ =Mg²⁺ + 2NO₃⁻ + 2H2O
2OH⁻ + 2H⁺ =2H2O
Ca(OH)2+2HCl=CaCl2+2H2O
Ca²⁺ + 2OH⁻ + 2H⁺ + 2Cl⁻ =Ca²⁺ + 2Cl⁻ + 2H2O
2OH⁻ + 2H⁺ =2H2O
2) 2Ca+O2=2CaO
CaO+H2O=Ca(OH)2
Ca(OH)2+2HNO3=Ca(NO3)2+2H2O
Ca²⁺ + 2OH⁻ + 2H⁺ + 2NO₃⁻ =Ca²⁺ + 2NO₃⁻ + 2H2O
2OH⁻ + 2H⁺ =2H2O