ElectrochemistryHard
Question
Tell which of the following statements accurately describes the effect of adding CN− to the cathode of a cell with a cell reaction: Cd + 2Ag+ → 2Ag + Cd2+, E° = 1.2 V
Options
A.E° increases because Cd(CN)42− forms
B.E° decreases because Cd(CN)42− forms
C.E° increases because Ag(CN)2− forms
D.E° decreases because Ag(CN)2− forms
Solution
$E_{cell} = E_{cell}^{o} - \frac{RT}{2F}.\ln\frac{\left\lbrack Cd^{2 +} \right\rbrack}{\left\lbrack Ag^{+} \right\rbrack^{2}}$
As CN– will form complex with Ag+ ion in the cathodic compartment, Ecell will decrease.
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