4 AuCl3 + 3 Se + 9 H2O → 4 Au + 3 H2SeO3 + 12 HCl
This is an oxidation-reduction (redox) reaction:
3 Se0 - 12 e- → 3 SeIV (oxidation)
4 AuIII + 12 e- → 4 Au0 (reduction)
Se is a reducing agent, AuCl3 is an oxidizing agent.
Reactants:
Products:
- Au
- H2SeO3 – Selenous acid , Selenic(IV) 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.]