Question

The ionization constant of aniline, acetic acid and water at ${25}^{\circ }C$ are $3.83\times {10}^{-10}$, $1.75\times {10}^{-5}$ and $1\times {10}^{-14}$ respectively. The percentage hydrolysis of aniline acetate in a decinormal solution is :

• A. 54.95%
• B. 9.54%
• C. 4.6%
• D. 42.3%

Answer 1

The correct option is A 54.95%

The expression for the hydrolysis constant $K_h$ is,
$K_h=\frac{K_w}{K_a\times K_b}=\frac{1\times {10}^{-14}}{1.75\times {10}^{-5}\times 3.83\times {10}^{-10}}=1.49$

The expression for the degree of hydrolysis h is,
$h=\frac{\sqrt{K_h}}{1+\sqrt{K_h}}=\frac{\sqrt{1.49}}{1+\sqrt{1.49}}=0.5495$.

Percentage hydrolysis $=100\times 0.5495=54.95\%$