8.26 :  Using the standard electrode potentials given in the Table 8.1, predict if the reaction between the following is feasible:
(a) ${\mathrm{Fe}}^{3+}$(aq) and ${\mathrm{I}}^{-}$(aq)
(b) ${\mathrm{Ag}}^{+}$(aq) and Cu(s)
(c) ${\mathrm{Fe}}^{3+}$ (aq) and Cu(s)
(d) Ag(s) and ${\mathrm{Fe}}^{3+}$(aq)
(e) ${\mathrm{Br}}_{2}\left(\mathrm{aq}\right)$ and ${\mathrm{Fe}}^{2+}$(aq)

(a) The possible reaction between ${\mathrm{Fe}}_{\left(\mathrm{aq}\right)}^{3+}+{{\mathrm{l}}^{-}}_{\left(\mathrm{aq}\right)}$
$2{{\mathrm{Fe}}^{3-}}_{\left(\mathrm{aq}\right)}+2{{\mathrm{l}}^{-}}_{\left(\mathrm{aq}\right)}\to 2{{\mathrm{Fe}}^{2+}}_{\left(\mathrm{aq}\right)}+{\mathrm{l}}_{2\left(\mathrm{s}\right)}$ is given by,
Oxidation half equation :
$\mathrm{E}°$ for the overall reaction is positive. Thus, the reaction between is feasible.
(b)  The possible reaction between ${{\mathrm{Ag}}^{+}}_{\left(\mathrm{aq}\right)}+{\mathrm{Cu}}_{\left(\mathrm{s}\right)}$ is given by,
$2{{\mathrm{Ag}}^{+}}_{\left(\mathrm{aq}\right)}+{\mathrm{Cu}}_{\left(\mathrm{s}\right)}\to 2{\mathrm{Ag}}_{\left(\mathrm{s}\right)}+{{\mathrm{Cu}}^{2+}}_{\left(\mathrm{aq}\right)}$
Oxidation half equation :
$\mathrm{E}°$ positive for the overall reaction is positive. Hence, the reaction between  is feasible.
(c) The possible reaction between  is given by,
$2{{\mathrm{Fe}}^{3+}}_{\left(\mathrm{aq}\right)}+{\mathrm{Cu}}_{\left(\mathrm{s}\right)}\to 2{{\mathrm{Fe}}^{2+}}_{\left(\mathrm{s}\right)}+{{\mathrm{Cu}}^{2+}}_{\left(\mathrm{aq}\right)}$
Oxidation half equation :
$\mathrm{E}°$ positive for the overall reaction is positive. Hence, the reaction between  is feasible.
(d) The possible reaction between
${\mathrm{Ag}}_{\left(\mathrm{s}\right)}+2{{\mathrm{Fe}}^{3+}}_{\left(\mathrm{aq}\right)}\to {{\mathrm{Ag}}^{+}}_{\left(\mathrm{aq}\right)}+{{\mathrm{Fe}}^{2+}}_{\left(\mathrm{aq}\right)}$ is given by,
Oxidation half equation :
Here, $\mathrm{E}°$ for the overall reaction is negative. Hence, the reaction between  is not feasible.
(e)  The possible reaction between  is given by,
${\mathrm{Br}}_{2\left(\mathrm{s}\right)}+2{{\mathrm{Fe}}^{2+}}_{\left(\mathrm{aq}\right)}\to 2{{\mathrm{Br}}^{-}}_{\left(\mathrm{aq}\right)}+2{{\mathrm{Fe}}^{3+}}_{\left(\mathrm{aq}\right)}$
Oxidation half equation :
Here, $\mathrm{E}°$ for the overall reaction is positive. Hence, the reaction between  is feasible.