Consider an electrochemical cell in which the following reaction occurs and predict which changes will decreases the cell voltage:
Fe2+(aq)+Ag+(aq)→Ag(s)+Fe3+(aq)
(I) decreases the [Ag+] (II) increases in [Fe3+] (III) increase the amount of Ag
II and III only
II only
I and II only
I only
A
I only
B
II only
C
I and II only
D
II and III only
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Solution
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The correct option is D I and II only Fe2+(aq)+Ag+(aq)→Ag(s)+Fe3+(aq)
Ecell=Eocell−0.05911log[Fe3+][Fe2+][Ag+]
(I) On increasing [Fe3+] −log[Fe3+][Fe2+][Ag+] decreases
∵EoCell is constant.
So, Ecell will decrease
(II) On decreasing [Ag+] −log[Fe3+][Fe2+][Ag+] decreases
So, Ecell will decrease
(III) Changing amount of Ag(s) will not affect Ecell
Option D is correct.
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