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Na₂SO₃ + SO₂→ NaSO₃ + CO₂↑ ��1��

2NaOH + SO₂→ Na₂SO₃ + H₂O ��2��

Na₂SO₃ + SO₂ + H₂O → 2NaHSO₃ ��3��

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Na₂SO₃ + 1/2O₂ → Na₂SO₄ ��4��

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Ca(OH)₂ + Na₂SO₃ → 2 NaOH + CaSO₃ ��6��

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CaSO₃+ 1/2O₂ → CaSO₄��8��

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