First slide

Acidic buffer

Question

The ${pK}_{a}$ of a weak acid (HA) is 4.5. The pOH of an aqueous buffered solution of HA in which 50% of the acid is ionized is

Moderate

A

4.5
B

2.5
C

9.5
D

7.0

Solution

For buffer solution :
$pH = {pK}_{a} + \log \frac{[Salt]}{[Acid]} = 4.5 + \log \frac{[Salt]}{[Acid]} As HA is 50 % ionized so [Salt] = [Acid] pH = 4.5 pH + pOH = 14 ∴ pOH = 14 - 4.5 = 9.5$

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