As2S3 + 5 Cl2 + 8 H2O → 2 H3AsO4 + 3 S + 10 HCl
This is an oxidation-reduction (redox) reaction:
2 AsIII - 4 e- → 2 AsV (oxidation)
3 S-II - 6 e- → 3 S0 (oxidation)
10 Cl0 + 10 e- → 10 Cl-I (reduction)
As2S3 is a reducing agent, As2S3 is a reducing agent, Cl2 is an oxidizing agent.
Reactants:
Products:
- H3AsO4 – Arsenic acid, arsoric acid
- S
- HCl – Chlorane , Hydrogen chloride
- Other names: Hydrochloric acid , M , Uriatic acid
- Appearance: Colorless, transparent liquid, fumes in air if concentrated ; Colorless gas ; Colourless compressed liquefied gas with pungent odour ; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]