1. SO₂ + Na₂O → Na₂SO₃
2. Na₂SO₃ + H₂SO₃ → 2NaHSO₃
3. NaHSO₃ + NaOH → Na₂SO₃ + H₂O
4. Na₂SO₃ + H₂SO₄ → Na₂SO₄ + SO₂ + H₂O
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Answers & Comments
1. SO₂ + Na₂O → Na₂SO₃
2. Na₂SO₃ + H₂SO₃ → 2NaHSO₃
3. NaHSO₃ + NaOH → Na₂SO₃ + H₂O
4. Na₂SO₃ + H₂SO₄ → Na₂SO₄ + SO₂ + H₂O