2 K3Cr2O7 + 28 HCl → 4 CrCl3 + 6 KCl + 5 Cl2 + 14 H2O
This is an oxidation-reduction (redox) reaction:
10 Cl-I - 10 e- → 10 Cl0 (oxidation)
4 Cr11/2 + 10 e- → 4 CrIII (reduction)
HCl is a reducing agent, K3Cr2O7 is an oxidizing agent.
Reactants:
- K3Cr2O7
- 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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