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The equilibrium constant for ionization of aliphatic amine R N H 2 (g) in water is R N H 2 ( g ) + H 2 O ( l ) ⇌ R N H 3 + ( a q ) + O H - ( a q ) is 8 × 1 0 - 6 at 25 ° C . Partial pressure of amine at equilibrium is 0.5 bar. The pOH of the aqueous solution of amine will be

Options

  1. A2.7
  2. B4.7
  3. C3.7
  4. D5.7

Correct answer

A. 2.7

Step-by-step solution

R N H 2 ( g ) 0.5 + H 2 O ( l ) ⇌ R N H 3 + ( a q ) x + O H - ( a q ) x for it equilibrium constant is given as K = [ R N H 3 + ] [ O H - ] [ R N H 2 ] Here K = 8 × 1 0 - 6 8 × 1 0 - 6 = x × x 0.5 x = 2 × 1 0 - 3 [ O H ] - = 2 × 1 0 - 3 M p O H = - l o g 2 × 1 0 - 3 = 2.7 .

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