Question

Calculate the degree of hydrolysis of $0.01M$ sodium acetate solution. $K_a=1.8\times {10}^{-5}$.

• A. $3.32\times {10}^{-4}$
• B. $4.24\times {10}^{-2}$
• C. $5.26\times {10}^{-3}$
• D. None of these

Answer 1

Answer: (D)

None of these

$K_a=1.8\times {10}^{-5}$, $C=0.01M$

For dissociation of weak acid-

$K_a=C{\alpha }^2$

$\alpha =\sqrt{\frac{K_a}{C}}=\sqrt{\frac{1.8\times {10}^{-5}}{0.01}}=\sqrt{1.8\times {10}^{-3}}=4.24\times {10}^{-2}$

Hence, option $B$ is correct.