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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 at 25 o C is

Options

  1. A6.9
  2. B7.0
  3. C1.0
  4. D7.2

Correct answer

A. 6.9

Step-by-step solution

Hydrolysis of salt of weak acid and weak base pH = 1 2 pK w + pK a − pK b = 1 2 14 + 3.2 - 3.4 = 6.9

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