What are the Uses of Potassium Dichromate? - QS Study
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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.