SO2 + 4 HI → 2 I2 + S + 2 H2O
This is an oxidation-reduction (redox) reaction:
SIV + 4 e- → S0 (reduction)
4 I-I - 4 e- → 4 I0 (oxidation)
SO2 is an oxidizing agent, HI is a reducing agent.
Reactants:
- 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.]
- HI – Iodane
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