Q. 8 A

Calculate the emf

Answer :

The cell reaction is :


2Cr + 3Fe2+ 3Fe + 2Cr3+


To calculate the emf of the cell, we apply the Nernst equation:


Ecell = E°cell log


Where n = number of electrons involved in the cell reaction


n = 6


E°cell = + 0.30 V (given)


Cr3+ = 0.1M, Fe2+ = 0.01M (given)


By putting R = 8.314 JK-1 mole-1


T = 298K


F = 96500 coulombs


We get,


Ecell = 0.30 – log


Ecell = 0.26V


Thus, the emf of the cell at 298 K is 0.26 V


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