СaCl₂ + Na₂CO₃ => CaCO₃↓ + 2NaCl
Ca²⁺ + 2Cl⁻ + 2Na⁺ + CO₃²⁻ => CaCO₃ + 2Na⁺ + 2Cl⁻
Ca²⁺ + CO₃²⁻ => CaCO₃
CaCO₃ + H₂SO₄ => CaSO₄ + СO₂↑ + H₂O
CaCO₃ + 2H⁺ + SO₄²⁻ => Ca²⁺ + SO₄²⁻ + CO₂ + H₂O
CaCO₃ + 2H⁺ => Ca²⁺ + CO₂ + H₂O
Fe₂(SO₄)₃ + 6NaOH => 2Fe(OH)₃↓ + 3Na₂SO₄
2Fe³⁺ + 3SO₄²⁻ + 6Na⁺ + 6OH⁻ => 2Fe(OH)₃ + 6Na⁺ + 3SO₄²⁻
2Fe³⁺ + 6OH⁻ => 2Fe(OH)₃