4 Zn + H3AsO4 + 8 HCl → 4 ZnCl2 + AsH3 + 4 H2O
This is an oxidation-reduction (redox) reaction:
AsV + 8 e- → As-III (reduction)
4 Zn0 - 8 e- → 4 ZnII (oxidation)
H3AsO4 is an oxidizing agent, Zn is a reducing agent.
Reactants:
- Zn
- 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.]
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