Redox Reactions And Electrochemistry Ques 604
Question: In a cell that utilises the reaction $ Zn(s)+2{H^{+}}(aq)\to Z{n^{2+}}(aq)+H_2(g) $ addition of $ H_2SO_4 $ to cathode compartment, will
Options:
A) increase the E and shift equilibrium to the right
B) lower the E and shift equilibrium to the right
C) lower the E and shift equlibrium to the left
D) increase the E and shift equilibrium to the left
Show Answer
Answer:
Correct Answer: A
Solution:
[a] $ Zn(s)+2{H^{+}}(aq)\rightarrow Z{n^{2+}}(aq)+H_2(g) $
$ E_{cell}=E{{{}^\circ }_{cell}}-\frac{0.059}{2}\log \frac{[Z{n^{2+}}][H_2]}{{{[{H^{+}}]}^{2}}} $
Addition of $ H_2SO_4 $ will increase $ [{H^{+}}] $ and $ E_{cell} $ will also increase and the equilibrium will shift towards RHS
