Gas - gas $1$on electrode

$\frac{1}{2} \mathrm{H}_{2(\mathrm{~g})} \rightarrow \mathrm{H}_{(\mathrm{aq})}^{+}+\mathrm{e}^{-}$

Cathodic Reaction

Metal-metal insoluble salt anion electrode

$\mathrm{Ag}_{(\mathrm{aq})}^{+}+\mathrm{e}^{-} \rightarrow \mathrm{Ag}_{(\mathrm{s})}$

$\mathrm{AgCl}_{(\mathrm{s})} \rightleftharpoons \mathrm{Ag}_{(\mathrm{aq})}^{+}+\mathrm{Cl}_{(\mathrm{aq})}^{-}$

$\mathrm{AgCl}_{(5)}+\mathrm{e}^{-} \rightarrow \mathrm{Ag}_{(\mathrm{s})}+\mathrm{Cl}_{(\mathrm{aq})}^{-}$

Overall redox reaction

$\frac{1}{2} \mathrm{H}_{2(\mathrm{~g})}+\mathrm{AgCl}_{(\mathrm{s})} \rightarrow \mathrm{H}_{(\mathrm{sq})}^{+}+\mathrm{Cl}_{(\mathrm{aq})}^{-}+\mathrm{Ag}_{(\mathrm{s})}$

Cell Representation

$\mathrm{Pt}\left|\mathrm{H}_{2(\mathrm{~g})}\right| \mathrm{kCl}_{(\mathrm{sol})}\left|\mathrm{AgCl}_{(\mathrm{s})}\right| \mathrm{Ag}$