pH of a buffer solution decreases by 0.02 units when 0.12 g of acetic acid is added to 250 mL of a buffer solution of acetic acid and potassium acetate at 27oC. The buffer capacity of the solution is

pH of a buffer solution decreases by 0.02 units when 0.12 g of acetic acid is added to 250 mL of a buffer solution of acetic acid and potassium acetate at 27oC. The buffer capacity of the solution is

  1. A

    0.1

  2. B

    10

  3. C

    1

  4. D

    0.4

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    Solution:

    Buffer capacity,   = No.of molesof acid added/litChange in PH

    No.of moles of acetic acid/lit = 0.1260×1000250                                                      =8×10-3     =8×10-32×10-2=0.4

     

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