Ncert Exercises & Solutions

Assertion:	An aqueous solution of ammonium acetate can act as a buffer.
Reason:	Acetic acid is a weak acid and NH₄OH is a weak base.

1. Both the assertion and the reason are true and the reason is the correct explanation of the assertion.

2. Both the assertion and the reason are true and the reason is not the correct explanation of the assertion.

3. Assertion is true but the reason is false.

4. Assertion is false but the reason is true.

Hint: An aqueous solution of ammonium acetate can act as a buffer.

Explanation:

A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. Its pH changes very little when a small amount of strong acid or base is added to it.

Ammonium acetate is a salt of a weak acid (CH₃COOH) and weak base (NH₄OH).

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

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