H2SeO3 + 2 SO2 + H2O → Se + 2 H2SO4
This is an oxidation-reduction (redox) reaction:
SeIV + 4 e- → Se0 (reduction)
2 SIV - 4 e- → 2 SVI (oxidation)
H2SeO3 is an oxidizing agent, SO2 is a reducing agent.
Reactants:
- H2SeO3 – Selenous acid , Selenic(IV) acid
- 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
Products: