Answer to Question #244136 in General Chemistry for Majed

Question

what is the afvantage of using pottassium dichromate over potassium permanganate in quantitative estimation of iron in an unknown sample??

Answer 1

Potassium dichromate (K2Cr2O7) is preferred over sodium dichromate in volumetric analysis, because K2Cr2O7 is hygroscopic in nature and, therefore, accurate weighing is not possible in normal atmospheric conditions.