Question

When sodium acetate is added to acetic acid, it:

• A. increases ionisation of acetic acid
• B. decreases ionisation of acetic acid
• C. increases ionisation of sodium acetate
• D. independent of concentration

Answer 1

Answer: (B)

decreases ionisation of acetic acid

Answer 2

Sodium acetate is a strong electrolyte and it has an ion $(C{{H}_{3}}CO{{O}^{-}})$ common with weak $C{{H}_{3}}COOH$ . Hence, it decrease the ionisation of $C{{H}_{3}}COOH$ due to common ion effect.