Question

Write balance chemical equation for reaction between H2O2 and MnO4  in acidic and basic medium.

Answer 1

Answer:

The unbalanced redox equation is as follows:

H202+MnO4--02+MnO2(basic)

All atoms other than H and O are balanced.

The oxidation number of Mn changes from +7 to +4. The change in the oxidation number is 3.

The oxidation number of O changes from -1 to 0. The change in the oxidation number per O atom is 1. The total change in oxidation number for 2 O atoms is 2.

To balance the increase in the oxidation number with decrease in the oxidation number multiply MnO4- and MnO2 with 2 and multiply H2O2 and O2 with 3..

3H2O2+2MnO4--302+2MnO2(basic)

To balance O atoms, add four water molecules on RHS.

3H202+2MnO4-302+2MnO2+4H2O(b

asic)

To balance H atoms, add 2H+ on LHS.

3H2O2+2MnO4-+2H+ 302