Although sodium dichromate () exhibits greater aqueous solubility and is extensively utilized as a primary oxidising agent in organic chemistry, potassium dichromate () is universally preferred exclus

Question

Although sodium dichromate ($Na_2Cr_2O_7$) exhibits greater aqueous solubility and is extensively utilized as a primary oxidising agent in organic chemistry, potassium dichromate ($K_2Cr_2O_7$) is universally preferred exclusively as a primary standard in precision volumetric analysis. Why?

Prashant Kotian · Accepted Answer

Correct answer: B. To be used as a primary standard in volumetric analysis, a substance must be incredibly stable and strictly non-hygroscopic so that it can be weighed with exact precision without absorbing atmospheric moisture. Sodium dichromate () is deliquescent/hygroscopic, making accurate weighing impossible. does not absorb moisture, making it ideal.

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