Redox Reactions And Electrochemistry Ques 610

Question: The reduction potential (in volt) of a hydrogen electrode set up with a $ 2\times {10^{-2}}M $ aqueous solution of a weak mono basic acid $ (K_{a}=5\times {10^{-5}}) $ at one atmosphere and $ 25{}^\circ C $ is

Options:

A) +0.09

B) +0.18

C) $ -0.09 $

D) $ -0.18 $

Show Answer

Answer:

Correct Answer: D

Solution:

[d] $ 2{H^{+}}+2{e^{-}}\xrightarrow{{}}H_2 $ $ E_{cell}=0.06,log[{H^{+}}]=0.06\times log\sqrt{K_{a}C} $ $ =0.06\times log{10^{-3}}=-0.18V $



NCERT Chapter Video Solution

Dual Pane