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(D) buffer solution is designed to resist changes in $pH$ upon the addition of small amounts of acid,base,or upon dilution.The $pH$ of an acidic buffe

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$H^{+}$ ion concentration remains unaltered

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(D) buffer solution is designed to resist changes in $pH$ upon the addition of small amounts of acid,base,or upon dilution.The $pH$ of an acidic buffer is given by the Henderson-Hasselbalch equation: $pH = pK_a + \log \frac{[Salt]}{[Acid]}$.Upon dilution,both the concentration of the salt $(CH_3COONa)$ and the acid $(CH_3COOH)$ decrease by the same factor.Therefore,the ratio $\frac{[Salt]}{[Acid]}$ remains constant.Consequently,the $pH$ and the $H^{+}$ ion concentration remain effectively unaltered.

When a buffer solution of sodium acetate and acetic acid is diluted with water,

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