Tarnished silver contains `Ag_2 ~S`. 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 the half reactions are `A g_2 S(s)+2 e^- 2 A g(s)^2+S^1--0.71 v` and `Al^4+3 e^- Al(s),-1.66 ~V`

Explanation

Tarnish will, be removed, since the reduction potential of `Ag_2 ~S` is greater than that of `Al^H, Ag_2 ~S`
will-undergo reduction, or will act as cathode, And the following reactions tảkes place.
``
Al+Ag_2 ~S Al^3++2 Ag+S^2-
``
EMF of this reaction,
Since emf is. +ve the reaction wili täke place and tarnish will be removed.