4 As2S3 + 5 HClO4 + 12 H2O → 12 S + 8 H3AsO4 + 5 HCl
This is an oxidation-reduction (redox) reaction:
8 AsIII - 16 e- → 8 AsV (oxidation)
12 S-II - 24 e- → 12 S0 (oxidation)
5 ClVII + 40 e- → 5 Cl-I (reduction)
As2S3 is a reducing agent, As2S3 is a reducing agent, HClO4 is an oxidizing agent.
Reactants:
Products:
- S
- H3AsO4 – Arsenic acid, arsoric acid
- 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.]