Question

[0] K Cr207/H2SO4 what is the role of chemical written ​

Answer 1

Answer:

Potassium dichromate, K2Cr2O7, is a common inorganic chemical reagent, most commonly used as an oxidizing agent in various laboratory and industrial applications. As with all hexavalent chromium compounds, it is acutely and chronically harmful to health. It is a crystalline ionic solid with a very bright, red-orange color. The salt is popular in the laboratory because it is not deliquescent, in contrast to the more industrially relevant salt sodium dichromate.[5]

Sulfuric acid, besides being an acid, is also a good dehydrating agent. When you mix cold sulfuric acid with potassium dichromate it gives red crystals of chromic anhydride (CrO3):

K2Cr2O7 + 2H2SO4 → 2CrO3 + 2 KHSO4 + H2O

On heating with concentrated acid, oxygen is evolved:

2 K2Cr2O7 + 8 H2SO4 → 2 K2SO4 + 2 Cr2(SO4)3 + 8 H2O + 3O2