Question

K${}_a$ for cyano acetic acid is $3.5\times {10}^{-3}$. Then the degree of hydrolysis of 0.05 M. Sodium cyano acetate solution will have the value:

• A. $4.559\times {10}^{-6}$
• B. $5.559\times {10}^{-6}$
• C. $6.559\times {10}^{-6}$
• D. $7.559\times {10}^{-6}$

Answer 1

The correct option is D $7.559\times {10}^{-6}$

Given that $C=0.05M$

Degree of Hydrolysis$=\sqrt{\frac{K_w}{K.C}}$

$=\sqrt{\frac{{10}^{-14}}{3.5\times {10}^{-3}\left(0.05\right)}}$

$=7.55\times {10}^{-6}$