20 HCl + 4 K2CrO4 + 3 P2O3 → H2O + 8 KCl + 6 H3PO4 + 4 CrCl3
This is an acid-base reaction (neutralization): HCl is an acid, K2CrO4 is a base.
This is an oxidation-reduction (redox) reaction:
6 PIII - 12 e- → 6 PV (oxidation)
4 CrVI + 12 e- → 4 CrIII (reduction)
P2O3 is a reducing agent, K2CrO4 is an oxidizing agent.
Reactants:
- 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
- K2CrO4 – Potassium chromate
- P2O3
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