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Na₂CO₃+SO₂→Na₂SO₃+CO₂(1)

2NaOH+SO₂→Na₂SO₃+H₂O (2)

Na₂SO₃+SO₂+H₂O→2NaHSO₃(3)

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2NaHSO₃+Ca(OH)₂→Na₂SO₃+CaSO₃+2H₂O (4)

Na2SO₃+Ca(OH)₂→2NaOH+CaSO₃(5)

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