question_answer 1)

  Assertion (A): A solution containing a mixture of acetic acid and sodium acetate maintains a constant value of pH on addition of small amounts of acid or alkali. Reason (R): A solution containing a mixture of acetic acid and sodium acetate acts as a buffer solution around pH 4.75.

Answer:

  (a) A solution containing a mixture of acetic acid and sodium acetate is a buffer solution hence its \[{{p}^{H}}\]will be constant.