Redox Reactions And Electrochemistry Ques 79
Question: If equivalent conductance of $ 1M $ benzoic acid is $ 12.8oh{m^{-1}}cm^{2} $ and if the conductance of benzoate ion and $ {H^{+}} $ ion are 42 and $ 288.42,oh{m^{-1}}cm^{2} $ respectively. its degree of dissociation is [DPMT 2005]
Options:
A) 39%
B) 3.9%
C) 0.35%
D) 0.039%
Show Answer
Answer:
Correct Answer: B
Solution:
$ \Lambda _{m,(C_6H_5COOH)}^{o}=\Lambda _{,(C_6H_5CO{O^{-}})}^{o}+\Lambda _{({H^{+}})}^{o} $ $ =42+288.42=330.42 $ $ \alpha =\frac{\Lambda _m^{c}}{\Lambda _m^{o}}=\frac{12.8}{330.42}=3.9% $
