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The standard oxidation ptoetial of zinic...

The standard oxidation ptoetial of zinic is 0.76 V and of silver is -0.80 V calculate the emf of the cell
`Zn|Zn(NO_(3))_(2)(0.25 M)||AgNO_(3)(0.1)M|Ag "at" 25^(@) C`

A

1.158 V

B

1.352 V

C

0.768 V

D

21.32 V

Text Solution

Verified by Experts

The cell reaction is `Zn+ 2Ag^(+) rarr 2 Ag + Zn^(2+)`
`E_("cell")^(@)=E_("oxi")^(@)` of `Zn + e_("red")^(@)` of `Ag=0.76 +0.80 =1.56 V`
We know that
`E_("cell") =E_("cell")^(@)-(0.0591)/(n) log [("products")]/[("reactants")] =E_("cell")^(@) -(0.0591)/(2) log (0.25)/(0.1xx0.1)`
`=1.56 -(0.0591)/(2) xx (1.0591)/(2)xx1.3979 =1.3979 =(1.56 -0 0.0413) V, E_("cell")=1.5187 V`
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