6 NaBr + Na2Cr2O7 + 14 HCl → 3 Br2 + 2 CrCl3 + 8 NaCl + 7 H2O
This is an oxidation-reduction (redox) reaction:
6 Br-I - 6 e- → 6 Br0 (oxidation)
2 CrVI + 6 e- → 2 CrIII (reduction)
NaBr is a reducing agent, Na2Cr2O7 is an oxidizing agent.
Reactants:
- NaBr – Sodium bromide
- Na2Cr2O7 – Sodium dichromate
- 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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