Question

The degree of dissociation of acetic acid (0.1 mol $L^{-1}$) in water ($K_a$ of acetic acid is ${10}^{-5}$) is:

• A. 0.01
• B. 0.1
• C. 1
• D. 0.02

Answer 1

Answer: (A)

0.01

Degree of dissociation, $\alpha =\sqrt{\frac{K_a}{conc.}}$

$\alpha =\sqrt{\frac{{10}^{-5}}{0.1}}=0.01$

$\therefore \alpha =0.01$

Hence, option (A) is correct.