Question

What is the electrode potential (in $V$ ) of the following electrode at ${{25}^{o}}C$ ? $N{{i}^{2+}}(0.1\,\,M)|Ni(s)$ (Standard reaction potential of $N{{i}^{2+}}|Ni$ is $-0.25\,\,V,\,\,\frac{2.303RT}{F}=0.06)$

• A. $-0.28\,\,V$
• B. $-0.34\,\,V$
• C. $-0.82\,\,V$
• D. $-0.22\,\,V$

Answer 1

Answer: (A)

$-0.28\,\,V$

Answer 2

$E_{cell}^{o}=E_{cell}^{o}-\frac{2.303RT}{nF}\log \left[ \frac{[Ni]}{[N{{i}^{2+}}]} \right]$ $=-0.25-\frac{0.06}{2}\log \left( \frac{1}{0.1} \right)$ $(\because \,\,n=2)$ $=-0.25-0.03\times 1$ ${{E}_{cell}}=-0.28\,\,V$