Chapter 19, Problem 67RQ

What will be the spontaneous reaction among ${\text{H}}_{\text{2}}{\text{SO}}_{\text{3}}{\text{, S}}_{\text{2}}{\text{O}}_{\text{3}}{}^{\text{2-}}{\text{, HOCl, and Cl}}_{\text{2}}$? The half-reactions involved are:

$\begin{array}{l}{\text{2H}}_{\text{2}}{\text{SO}}_{\text{3}}{\text{+ 2H}}^{\text{+}}\text{+ 4}{e}^{\text{-}}\stackrel{}{\rightleftharpoons }{\text{S}}_{\text{2}}{\text{O}}_3^{2-}{\text{ + 3H}}_{\text{2}}\text{O}\hfill \\ E_{{\text{H}}_{\text{2}}{\text{SO}}_{\text{3}}}^{\text{o}}\text{ = 0}\text{.40 V}\hfill \\ {\text{2HOCl + 2H}}^{\text{+}}\text{+2}{e}^{\text{-}}\stackrel{}{\rightleftharpoons }{\text{Cl}}_{\text{2}}{\text{+ 2H}}_{\text{2}}\text{O}\hfill \\ E_{\text{HOCl}}^{\text{o}}\text{ = 1}\text{.63 V}\hfill \end{array}$