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In a buffer solution having equal concentrations of B - and HB the value of K b for B - is 1 0 - 9 . The pH of buffer solution is

Options

  1. A9
  2. B5
  3. C4
  4. D6

Correct answer

B. 5

Step-by-step solution

For acidic buffer pH can be find out as follows pH = pKa + lo g 10 [ s a l t ] [ a c i d ] As here K b = 1 0 - 9 So K a = 1 0 - 5 p K a = 5 As pH = 5 + ⁡ l o g 10 [ B - ] [ H B ] As [ B - ] = [ HB ] pH = 5 + log   1 = 5   +   0   =   5

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