Question

Balance the redox reaction in basic medium.
MnO4^- + I- → I2 + MnO2​

Answer 1

Explanation:

In the reduction half reaction, the oxidation state of Mn has reduced from +7 to +4. Thus, 3 electrons are added to the LHS of the reaction.

MnO-4(aq) + 3e- →MnO2(aq)

Now, to balance the charge, we add 4 OH- ions to the RHS of the reaction as the reaction is taking place in a basic medium.

MnO-4(aq) + 3e- →MnO2(aq) + 4OH-