Question

If equivalent conductance of $\rightarrow$ benzoic acid is $\rightarrow$ and if the conductance of benzoate ion and $\rightarrow$ ion are 42 and $\rightarrow$ respectively. its degree of dissociation is.

• A. 39%
• B. 3.9%
• C. 0.35%
• D. 0.039%

Answer 1

Answer: (B)

3.9%

Answer 2

$\Lambda_{m(C_{6}H_{5}COOH)}^{o} = \Lambda_{(C_{6}H_{5}COO^{-})}^{o} + \Lambda_{(H^{+})}^{o}$

$= 42 + 288.42 = 330.42\alpha = \frac{\Lambda_{m}^{c}}{\Lambda_{m}^{o}} = \frac{12.8}{330.42} = 3.9\%$