Question
Tarnished silver contains Ag2S. Can this tarnish be removed by placing tarnished silver ware in an aluminium pan containing an inert electrolytic solution such as NaCl? The standard electrode potential for half reaction:
$\text{Ag}_2\text{S(s) + 2e}^-\xrightarrow{\ \ \ \ \ \ \ }2\text{Ag(s) + S}^{2-}\text{is}-0.71\text{V}$
and for $\text{Al}^{3+}+3\text{e}^{-}\xrightarrow{ \ \ \ \ \ \ \ \ \ \ }2\text{Al(s) is}-1.66\text{V}$
$\text{Ag}_2\text{S(s) + 2e}^-\xrightarrow{\ \ \ \ \ \ \ }2\text{Ag(s) + S}^{2-}\text{is}-0.71\text{V}$
and for $\text{Al}^{3+}+3\text{e}^{-}\xrightarrow{ \ \ \ \ \ \ \ \ \ \ }2\text{Al(s) is}-1.66\text{V}$
