Question

The $K_a$ value of acetic acid is $1.8 \times 10^{-5}$. What would be the degree of ionization of 0.02 M acetic acid, containing 0.01 M Sodium acetate in it?}

• A. $1.5 \times 10^{-3}$
• B. $1.8 \times 10^{-3}$
• C. $3 \times 10^{-2}$
• D. $1.5 \times 10^{-2}$

Hint:

In common ion effect problems for weak acids or bases, the concentration of the common ion supplied by the weak electrolyte is almost always negligible compared to the strong electrolyte. Directly using $[Salt]$ for the conjugate ion concentration saves valuable time during exams.

Answer 1

The Correct Option is B