H2O + 16 HCl + 2 K2Cr2O7 + 3 As2O3 → 4 KCl + 4 CrCl3 + 6 H3AsO4
This is an oxidation-reduction (redox) reaction:
6 AsIII - 12 e- → 6 AsV (oxidation)
4 CrVI + 12 e- → 4 CrIII (reduction)
As2O3 is a reducing agent, K2Cr2O7 is an oxidizing agent.
Reactants:
- H2O – Water, oxidane
- 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.]
- Other names: Hydrochloric acid
- K2Cr2O7 – Potassium dichromate(VI)
- As2O3 – Diarsenic trioxide
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