А)2LiOH + H2SO4 =Li2SO4 + 2H2O
2Li⁺ + 2OH⁻ +2H⁺ + SO₄²⁻ = 2Li⁺ + SO₄²⁻ + 2H2O
2OH⁻ + 2H⁺ =2H2O
Б) Pb(NO3)2 + H2SO3 →PbSO3 + 2HNO3
Pb²⁺ + 2NO₃⁻ + 2H⁺ + SO₃²⁻ =PbSO3 + 2H⁺ + 2NO₃⁻
Pb²⁺ + SO₃²⁻ =PbSO3 + 2H⁺ + 2NO₃⁻
В) AgNO3 + HBr →AgBr + HNO3
Ag⁺ + NO₃⁻ + H⁺ + Br⁻ =AgBr + H⁺ + NO₃⁻
Ag⁺ + Br⁻ =AgBr
3) KOH +HF=KF + H2O