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The pH of the solution containing 50 mL each of 0.10 M sodium acetate and 0.01 M acetic acid is [Given $pK_a$ of $CH_3COOH=4.57$]
A
2.57
B
5.57
C
3.57
D
4.57
Detailed Solution
$CH_3COOH$ (weak acid) and $CH_3COONa$ (its salt with a strong base) form an acidic buffer.
$pH = pK_a + \log\frac{[Salt]}{[Acid]}$
$= 4.57 + \log\left(\frac{0.1}{0.01}\right) = 4.57 + 1 = 5.57$