The standard reduction potential of `Cu^(2+)|Cu and Ag^+|Ag` electrodes are 0.337 and 0.799 volt respectively. Construct a galvanic cell using these electrodes so that its standard emf is positive. For what concentration of `Ag^(+)` will the emf of the cell at `25^@ C` be zero if the concentration of `Cu^(2+)` is 0.01M?

Explanation

``
E_c u=c v^o=0.337 VE^circ=0.799 ~V . If these
`` two are coupled to form a ceH. Ag will act as cathode, since it has greater reduction potential. Hence cell is
`Cu / Cu^2- / / Ag^4 / Ag`
Cell reaction is ``Cu+2 Ag^* Cu^2++2 Ag
``Nernst equation is
`log [Ag^*]=-8.817`
``|Ag^*|= antilog (-8,817)=1.524 xx 10^- M``