1) CuSO₄ + 2NaOH = Cu(OH)₂↓ + Na₂SO₄
Cu²⁺ + SO₄²⁻ + 2Na⁺ + 2OH⁻ = Cu(OH)₂↓+ 2Na⁺ + SO₄²⁻
Cu²⁺ + 2OH⁻ = Cu(OH)₂↓
2)FeCl₃ + 3NaOH = Fe(OH)₃↓ + 3NaCl
Fe³⁺ + 3Cl⁻ + 3Na⁺ + 3OH⁻ = Fe(OH)₃↓+ 3Na⁺ + 3Cl⁻
Fe³⁺+ 3OH⁻ = Fe(OH)₃↓
3) Fe₂O₃ + 6HCl = 2FeCl₃ +3H₂O
Fe₂O₃ + 6H⁺ + 6Cl⁻ = 2Fe³⁺ + 6Cl⁻ + 3H₂O
Fe₂O₃ + 6H⁺ = 2Fe³⁺ + 3H₂O
4) FeCl₃ + 3AgNO₃ = Fe(NO₃)₃ + 3AgCl↓
Fe³⁺ + 3Cl⁻ + 3Ag⁺ + 3NO₃⁻ = Fe³⁺ + 3NO₃⁻ + 3AgCl↓
3Cl⁻ + 3Ag⁺ = 3AgCl↓