What are the Uses of Potassium Dichromate?

Potassium Dichromate is used for Chromyl chloride test.

When salt containing chloride is treated with Potassium dichromate (K2Cr2O7) and con. H2SO4 reddish brown vapours of chromyl chloride are obtained.

K2Cr2O7 + 4KCl + 6H2SO4 → 2CrO2Cl2 (Chromylchloride) + 6 KHSO4 + 3H2O

This reaction is used in the detection of chloride ions in qualitative analysis.

Other Uses are:

i) It is used in volumetric analysis

ii) In chrome tanning in leather industry

iii) In calico printing and dyeing

iv) In photography and in hardening gelatin film.

Share This Post