2 NaHSO3 + Zn + SO2 → Na2S2O4 + ZnSO3 + H2O
This is an oxidation-reduction (redox) reaction:
2 SIV + 2 e- → 2 SIII (reduction)
Zn0 - 2 e- → ZnII (oxidation)
Reactants:
- NaHSO3 – Sodium hydrogen sulfite
- Zn
- SO2 – Sulfur dioxide
- Other names: Sulfurous anhydride , Sulphur dioxide , Sulfurous acid anhydride
- Appearance: Colorless gas ; Colourless gas or compressed liquefied gas with pungent odour ; Colorless gas with a characteristic, irritating, pungent odor. [Note: A liquid below 14°F. Shipped as a liquefied compressed gas.]
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