2NaOH + SO → Na₂SO₃ + H₂O
Na₂O + H₂SO₄ → Na₂SO₄ + H₂O
CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂
Ca(OH)₂ + H₃PO₄ → Ca₃(PO₄)₂ + 2H₂O
2NaOH + SO → Na₂SO₃ + H₂O
Na₂O + H₂SO₄ → Na₂SO₄ + H₂O
CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂
Ca(OH)₂ + H₃PO₄ → Ca₃(PO₄)₂ + 2H₂O