A galvanic (voltaic) cell consists of an electrode composed of aluminum in a 1.0

Question

A galvanic (voltaic) cell consists of an electrode composed of aluminum in a 1.0 M aluminum ion solution and another electrode composed of Silver in a 1.0 M ion solution, connected by a salt bridge. Calculate the standard potential for this cell at 25 C. Use following standard potential values:    Al^+3 (aq) + 3e^-   ------------> Al (s) = -1.66

                                                                                              Ag ^+ (aq) + e^- ------------> Ag(s) = +0.80

Ecell =   ? V

Explanation / Answer

Al3+(aq) + 3Ag(s) ----> 3Ag+(aq) + Al(s)
so Eo= 1.66+0.8
=2.46 V
using nerst's equation,
E=Eo - (0.059/)*log([Ag+]^3/[Al3+])
= Eo - 0 (since concentrations are 1M)
= Eo
=2.46 V

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