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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 27^ C . The buffer capacity of the solution is

Options

  1. A0.1
  2. B10
  3. C1
  4. D0.4

Correct answer

D. 0.4

Step-by-step solution

Buffer capacity, = d C_ HA d_ pH , where, d C_ HA = no. of moles of acid added per litre aligned d_ pH & = change in pH d C_ HA & = moles of acetic acid volume & = 0.12 / 60 250 / 1000 = 1 125 & = 1 / 125 0.02 = 1 2.5 =0.4 aligned

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