Question

Which of the following will suppress the ionization of acetic acid in aqueous solution?

• A. $NaCl$
• B. $HCl$
• C. $KCl$
• D. Unpredictable

Answer 1

The correct option is B $HCl$

Common ion effect is observed when a solution of weak electrolyte is mixed with a solution of a strong electrolyte, which provides an ion common to that provided by the weak electrolyte.

Acetic acid is a weak electrolyte. $HCl$ is a strong electrolyte. $HCl$ provides hydrogen ion which is common to that provided by acetic acid.

Option B is correct.