Chapter 19, Problem 22E

In each of the following examples, sketch a voltaic cell that uses the reaction. Label the anode and cathode; indicate the direction of electron flow; write a balanced equation for cell reaction; and calculate $E_{\text{col}}^{°}$ .

a. $\text{Cu}\left(\text{s}\right){\text{+Fe}}^{\text{2+}}\left(\text{aq}\right)+{\text{Fe}}^{2+}\left(\text{aq}\right)$

b. ${\text{Pb}}^{\text{2+}}\left(\text{aq}\right)$ is displaced from solution by Al(s)

c. ${\text{Cl}}_{\text{2}}\left(\text{g}\right){\text{+H}}_{\text{2}}\text{O}\left(\text{l}\right)\to {\text{Cl}}^{\text{-}}\left(\text{aq}\right)+{\text{O}}_{\text{2}}\left(\text{g}\right)+{\text{H}}^{\text{4}}\left(\text{aq}\right)$

d. $\text{Zn}\left(\text{s}\right)+{\text{H}}^{\text{4}}{\text{+NO}}_2^{-}\to {\text{H}}_{\text{2}}\text{O}\left(\text{l}\right)+\text{NO}\left(\text{g}\right)$