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Q.

The ${pK}_{a}$ of a weak acid, $HA$ , is 4.80. The ${pK}_{a}$ of a weak base, $BOH$ , is 4. 78. The pH of an aqueous solution of the corresponding salt, $BA$ , will be :

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a

4.79

b

7.01

c

9.22

d

9.58

answer is B.

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Detailed Solution

pH value is calculated as,

$pH = \frac{1}{2} [p K_{w} + p K_{a} - p K_{b}]$

$\begin{aligned} pH = \frac{1}{2} (14 + 4.80 - 4.78) \\ = 7.01 \end{aligned}$

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