Question

State the uses of potassium dichromate.

Answer 1

Uses of K₂Cr₂O₇: K₂Cr₂O₇ is used.

i. in volumetric analysis, as a primary standard for the estimation of Fe²⁺ (ferrous ions) and I^- (iodides) in redox titrations. 

ii. in the manufacture of chromium compounds such as lead chromate and chrome alum. 

iii. in calico printing and dyeing. 

iv. in the tanning of leather. 

v. as a powerful oxidising agent. 

vi. in the chromyl chloride test for the detection of chloride ion. 

vii. in the manufacture of pigments and inks. 

viii. by dissolving in concentrated sulphuric acid resulting in the formation of chromic acid which is used as degrease glassware.