3 Zn + K2Cr2O7 + 14 HCl → 3 ZnCl2 + 2 CrCl3 + 2 KCl + 7 H2O
This is an oxidation-reduction (redox) reaction:
3 Zn0 - 6 e- → 3 ZnII (oxidation)
2 CrVI + 6 e- → 2 CrIII (reduction)
Zn is a reducing agent, K2Cr2O7 is an oxidizing agent.
Reactants:
- Zn
- K2Cr2O7 – Potassium dichromate(VI)
- 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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