Video: Dichromate ion as an oxidizing agent II

Yellow dichromate ion is reduced to green chromium(III) ion when ethanol is added.

Cr2O72-(aq) + 14 H+(aq) + 6 e- ® 2 Cr3+(aq) + 7 H2O(l)
CH3CH2OH(aq) + H2O(l) ® CH3CO2H(aq) + 4 H+(aq) + 4 e-