-->

Electrochemistry

Question
CBSEENCH12005958

What is the effect of change in (a) concentration, (b) temperature on the electrode potential of a given half-cell?

Solution
For a half-cell in which the electrode reaction is,
               Mn++ne- = M
The Nernst equation is
         E = E°Mn+/M-2.303 RTnFlog1Mn+    = E°Mn+/M+2.303 RTnFlog[Mn+]
From the equation, E ∝ T and E ∝ [Mn+]
(a) When the concentration of Mn+ increases, the half-cell potential increases and vice-versa.
(b) When temperature increases, the half-cell potential also increases.