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NTA Abhyas NEET2020ChemistryIonic EquilibriumPractice

In a buffer solution containing equal concentrations of B - and HB the K b for B - is 1 0 - 10 . The pH of buffer solution is

Options

  1. A4
  2. B5
  3. C7
  4. D6

Correct answer

A. 4

Step-by-step solution

For acidic buffer pH can be find out as follows p H = p K a + l o g 10 [ s a l t ] [ a c i d ] Here K b = 1 0 - 10 K a = 1 0 - 4 , p K a = 4 As p H = 4 + l o g 10 [ B - ] [ H B ] As [ B - ] = [ H B ] p H = 4 + l o g 1 = 4

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