Question

$K_a$ for cyano acetic acid is $3.5\times {10}^{-3}.$ Then the degree of hydrolysis of $0.05M$ sodium cyano acetate solution will have the following 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

Answer: (D)

$7.559\times {10}^{-6}$

concetration of the solution $=0.05M$

Degree of hydrolysis, $h=\sqrt{\frac{K_w}{K_a\times C}}$

$=\sqrt{\frac{1\times {10}^{-14}}{3.5\times {10}^{-3}\times 0.05}}=7.55\times {10}^{-6}$