Question

Balance the following redox equation in basic solution using the half-reactions method. H₂O₂ + Cr³⁺ = CrO₄^2- + H₂O

Answer 1

First assign oxidation number to each atom

Then identify the oxidant and reductant

Balance allthe atom except O and H

Balancing the oxygen atoms. if there are not the same no. of oxygen atoms on both the side then equilibrate the O atoms by adding water molecules.

For balancing the reactions in a basic medium, add each OH^- ion on both sides to balance the charge and atoms

Now balance the charge

Now rewrite the complete equation

simplifying the equation