S2O32- + 2 H+ → SO2 + H2O + S
This is an oxidation-reduction (redox) reaction:
SII + 2 e- → S0 (reduction)
SII - 2 e- → SIV (oxidation)
S2O32- is both an oxidizing and a reducing agent (disproportionation (dismutation)).
Reactants:
- S2O32-
- H+
Products:
- 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.]
- H2O – Water, oxidane
- S