First slide

Acidic buffer

Question

In which case pH will not change on dilution

Moderate

A

$0.01 M {CH}_{3} COONa + 0.01 M {CH}_{3} COOH buffer$
B

$0.01 M {CH}_{3} {COONH}_{4}$
C

$0.01 M {NaH}_{2} {PO}_{4}$
D

in all cases

Solution

Mixture of sodium acetate and acetic acid is a buffer of pH value equal to ${pK}_{a}$ so its buffer capacity is very high and hence its pH will not change significantly while ${CH}_{3} {COONH}_{4}$ is a salt of weak acid ${CH}_{3} COOH$ and weak base ${NH}_{4} OH$ whose magnitude of $K_{a} and K_{b}$ are equal. So its pH does not depend upon concentration. Furthermore, ${NaH}_{4} {PO}_{4}$ is, in fact, a single solute buffer.

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