Question

# Calculate the potential at 25o C for the following cell reaction. a) Cu (s)+ 2Ag (aq)...

Calculate the potential at 25o C for the following cell reaction.

a) Cu (s)+ 2Ag (aq) --> Cu2+ (aq) + 2Ag (s)

b) 3Cu2+ (aq) +2Al (s) --> 3Cu (s) +2Al3+

a) Cu (s)+ 2Ag (aq) --> Cu2+ (aq) + 2Ag (s)

At anode ( oxidation) : Cu (s) --> Cu2+ (aq) +2e-   :   EoCu2+/Cu = +0.34 V

At cathode ( reduction) : Ag+ (aq)+e- --> Ag (s)    : EoAg/Ag+ = +0.80 V

So standard potential of the cell , Eo = Eocathode - Eoanode

= EoAg/Ag+ - EoCu2+/Cu

= +0.80 - (+0.34) V

= +0.46 V

Therefore the standard potential of the cell is +0.46 V

b) 3Cu2+ (aq) +2Al (s) --> 3Cu (s) +2Al3+

At anode ( oxidation) : Al (s) --> Al3++3e-   :   EoAl3+/Al = -1.66 V

At cathode ( reduction) : Cu2+ (aq) +2e- --> Cu (s) : EoCu2+/Cu = +0.34 V

So standard potential of the cell , Eo = Eocathode - Eoanode

=   EoCu2+/Cu - EoAl3+/Al

= +0.34 - (-1.66) V

= +2.00 V

Therefore the standard potential of the cell is +2.00 V

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