Ca²⁺+ CO₃²⁻= CaCO₃↓
Ca²⁺ + 2CI⁻ + 2Na⁺+ CO₃²⁻ = CaCO₃↓ + 2Na⁺ + 2CI⁻
CaCI₂ + Na₂CO₃ = CaCO₃↓ + 2NaCI
Al₂O₃+6H⁺=2Al³⁺+3H₂O
AI₂O₃ + 6H⁺ + 3SO₄²⁻ = 2AI³⁺ +3SO₄²⁻ + 3H₂O
AI₂O₃ + 3H₂SO₄ = AI₂(SO₄)₃ + 3H₂O
Ba²⁺ + SO₄²⁻ = BaSO₄↓
Ba²⁺ + 2CI⁻ + 2H⁺ + SO₄²⁻ = BaSO₄↓ + 2H⁺ + 2CI⁻
BaCI₂ + H₂SO₄ = BaSO₄↓ + 2HCI
NiSO₄+(NH₄)₂S=(NH₄)₂SO₄ + NiS↓
Ni²⁺+ SO₄²⁻ + 2NH₄⁺ + S²⁻ = 2NH₄⁺ + SO₄²⁻ + NiS↓
Ni²⁺ + S²⁻ = NiS↓