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pK_a of a weak acid (HA) and pK_b of a weak base (BOH) are 3.2 and 3.4,respectively. The pH of their salt (AB) solution is

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7.2

6.9

7.0

1.0

answer is B.

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Detailed Solution

We know, pH = $\frac{1}{2}$ (pK_w+ pK_a − pK_b)
pH = $\frac{1}{2}$ (14 + 3.2 −3.4)
pH = $\frac{1}{2}$ (13.8)
pH=6.9

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