Chapter 19, Problem 19.123SP

A mercury battery uses the following electrode half-reactions:
$HgO(s)+H_{2}O(l)+2e^{-}\to Hg(l)+2O{H}^{-}(aq)$ $E^o=0.098\text{ V}$
$ZnO(s)+H2O(l)+2e^{-}\to Zn(s)+2O{H}^{-}(aq)$ $E^o=-1.260\text{ V}$
(a) Write a balanced equation for the overall cell reaction.
(b) Calculate $\Delta G^o$ (in Icilojoules) and K at 25 °C for the cell reaction.
(c) What is the effect on the cell voltage of a tenfold change in the concentration of KOH in the electrolyte? Explain.