2 As2S3 (s) + 9 O2 (g) → 2 As2O3 (s) + 6 SO2 (aq)
This is an oxidation-reduction (redox) reaction:
6 S-II - 36 e- → 6 SIV (oxidation)
18 O0 + 36 e- → 18 O-II (reduction)
As2S3 is a reducing agent, O2 is an oxidizing agent.
Reactants:
Products:
- As2O3 – Diarsenic trioxide
- 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.]