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2 ,   4 -dinitrophenol ( pKa   =   4 ) acts as buffer and if pH of this buffer is adjusted to 5 , the ratio of concentration of dissociated and undissociated molecules of 2 ,   4 -dinitrophenol is:

Options

  1. A1
  2. B10
  3. C12
  4. D0 . 01

Correct answer

B. 10

Step-by-step solution

pH = pK a + log C. Base acid (C.Base=Conjugate base) 5 = 4 + log C. Base acid log C. Base acid = 1 ∴   C. Base acid = Dissociated ions undissociated acid = 1 0

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