Chapter 5, Problem 9RQ

In Question 5.8, which half-reaction represents oxidation? Which represents reduction?

5.8 What arc the net charges on the left and right sides of the following equations? Add electrons as necessary to make each of them a balanced half-reaction.

$\begin{array}{l}(\text{a}){\text{ NO}}_3^{-}+10{\text{H}}^{+}\stackrel{}{\to }{\text{NH}}_4^{+}+{\text{3H}}_{\text{2}}{\text{O}}^{\text{+}}\\ (\text{b}){\text{ Cl}}_{\text{2}}+4{\text{H}}_{\text{2}}\text{O}\stackrel{}{\to }2{\text{ClO}}_{\text{2}}^{\text{-}}+8{\text{H}}^{\text{+}}\end{array}$