1) MgCl₂ + Na₂C0₃=MgCO₃ + 2NaCl
Mg²⁺ + 2Cl⁻ + 2Na⁺ + CO₃²⁻ = MgCO₃ + 2Na⁺ + 2Cl⁻
Mg²⁺ + CO₃²⁻ = MgCO3
2) AgNO₃ + KBr = AgBr + KNO₃
Ag⁺ + NO₃⁻ + K⁺ + Br⁻ = AgBr + K⁺ + NO₃⁻
Ag(+) + Br(-) = AgBr
3) LiOH + HF = LiF + H₂O
LI⁺ + OH⁻ + H⁺ + F⁻ = Li⁺ + F⁻ + H₂O
OH⁻ + H⁺ = H₂O
4) FeSO₄ + 2NaOH = Fe(OH)₂ + Na₂SO₄
Fe₂⁺ + SO₄²⁻ + 2Na⁺ + 2OH⁻ = Fe(OH)₂ + 2Na⁺ + SO₄²⁻
Fe²⁺ + 2OH⁻ = Fe(OH)₂
5) Al(OH)₃ + 3HCl = AlCl₃ + 3H₂O
Al(OH)₃ + 3H⁺ + 3Cl⁻ = Al³⁺ + 3Cl⁻ + 3H₂O
Al(OH)₃ + 3H⁺ = Al³⁺ + 3H₂O
6) CuSO₄ + 2KOH = Cu(OH)₂ + K₂SO₄
Cu²⁺ + SO₄²⁻ + 2K⁺ + 2OH⁻ = Cu(OH)₂ + 2K⁺ + SO₄²⁻
Cu²⁺ + 2OH⁻ = Cu(OH)₂