Redox Reactions And Electrochemistry Ques 89
Question: The standard $ EMF $ for the given cell reaction $ Zn+C{u^{2+}}=Cu+Z{n^{2+}} $ is $ 1.10V $ at $ 25^{o}C $ . The $ EMF $ for the cell reaction, when $ 0.1M,C{u^{2+}} $ and $ 0.1M,Z{n^{2+}} $ solutions are used, at $ 25^{o}C $ is [MNR 1994; AMU 1999; UPSEAT 2002]
Options:
A) $ 1.10,V $
B) $ 0.110,V $
C) $ -1.10,V $
D) $ -,0.110,V $
Show Answer
Answer:
Correct Answer: A
Solution:
$ E_{cell}=E_{cell}^{o}-\frac{0.059}{2}\log \frac{(Z{n^{++}})}{(C{u^{++}})} $ $ =1.10-\frac{0.059}{2}\log \frac{0.1}{0.1}=1.10V $ .
