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Question

Which is the correct value for the standard potential for a silver-copper voltaic cell?
The standard half cell potential at 298 K are:
Ag+(aq)+eAg(s);Eored=x
Cu2+(aq)+2eCu(s):Eored=y
[x>y]


A
x + 2y
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B
2x + y
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C
x - y
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D
y - 2x
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Solution

The correct option is C x - y
The standard reduction potentials of half cells are
EAg+(aq)/Ag(s)=x V
ECu2+(aq)/Cu(s)=y V

x>y

Metal which having higher reduction potential will undergo reduction and metal having lower reduction potential will undergo oxidation.
Thus,
Ag+ is reduced to Ag and Cu is oxidised to Cu2+
Ecell=SRP of substance reducedSRP of substance oxidised

Ecell=Ecathode (red)Eanode (red)

Ecell=EAg+(aq)/Ag(s)ECu+(aq)/Cu(s)

Ecell=(xy) V

Thus, the correct answer is (c).


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