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Statement: The pH of an aqueous solution...

Statement: The pH of an aqueous solution of acetic acid remains unchanged on the addition of sodium acetate.
Explanation: The ionisation of acetic acid is suppressed by the addition of sodium acetate.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
D
Addition of a small amount of `CH_(3)COONa` to acetic acid increase the pH value because `CH_(3)COONa` is a strong electrolyte and thus ionizes to give `CH_(3)COO^(-) and Na^(+)` ions. Due to common ion effect, it suppresses the ionization of `CH_(3)COOH` which decreases `[H^(+)]` and hence pH value increase.
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