4 H+ + SO42- + 2 (I)- → SO2 + I2 + 2 H2O
This is an oxidation-reduction (redox) reaction:
SVI + 2 e- → SIV (reduction)
2 I-I - 2 e- → 2 I0 (oxidation)
SO42- is an oxidizing agent, I- is a reducing agent.
Reactants:
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.]
- I2
- H2O – Water, oxidane