1. 2H₂SO₄ + Cu → CuSO₄ + SO₂ + 2H₂O
2. SO₂ + NaOH → NaHSO₃
3. 2NaHSO₃ →t°C Na₂SO₃ + SO₂ + H₂O
3. Na₂SO₃ + 2AgNO₃ → 2NaNO₃ + Ag₂SO₃
4. 2NaNO₃ →t°C 2NaNO₂ + O₂
5. C + O₂ →t°C CO₂
6. CO₂ + CaO → CaCO₃
1. 2H₂SO₄ + Cu → CuSO₄ + SO₂ + 2H₂O
2. SO₂ + NaOH → NaHSO₃
3. 2NaHSO₃ →t°C Na₂SO₃ + SO₂ + H₂O
3. Na₂SO₃ + 2AgNO₃ → 2NaNO₃ + Ag₂SO₃
4. 2NaNO₃ →t°C 2NaNO₂ + O₂
5. C + O₂ →t°C CO₂
6. CO₂ + CaO → CaCO₃