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

1) 7.0

2) 1.0

3) 7.2

4) 6.9

Answer: (4)

pH = 7 + [(1 / 2) (pKa – pKb)]

= 7 + (1 / 2) [3.2 – 3.4]

= 6.9

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