Question

Calculate the ratio of degree of dissociation $\left({\alpha }_2/{\alpha }_1\right)$ when $1M$ acetic acid solution is diluted to $\frac{1}{100}$ times.

[Given that : $K_a=1.8\times {10}^{-5}$]

• A. 1
• B. 5
• C. 8
• D. 10

Answer 1

The correct option is D 10

$K_a=C{\alpha }^2$

$\Rightarrow \frac{{\alpha }_2}{{\alpha }_1}=\sqrt{\frac{C_1}{C_2}}=\sqrt{\frac{1}{1/100}}=10$