Question

When h2o2 is added to an acidified solution of k2cr2o7?

Answer 1

H2O2 is added to an acidified solution of K2Cr2O7 when we need a redox reaction. Redox reaction is a type of reaction in which one compound is oxidized and other is reduced. In this reaction H2O2 is oxidized and K2Cr2O7 is reduced. Final product consist of Oxygen, K2SO4 and Cr2(SO4)3.

Answer 2

Explanation:

When hydrogen peroxide is added to acidified solution of potassium dichromate , the chromium present in +6 oxidation state changes to +3 oxidation state. In acidic medium, potassium dichromate act as an strong oxidizing agent which oxidizes the oxygen in hydrogen peroxide from -1 to 0 oxidation state in oxygen atom

$K_2Cr_2O_7+H^++3H_2O_2\rightarrow 3O_2+2Cr^{3+}+2K^++7H_2O$