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Q.

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

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a

0.1

b

10

c

1

d

0.4

answer is D.

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Detailed Solution

Buffer capacity, ∅  = No.of molesof acid added/litChange in PHNo.of moles of acetic acid/lit = 0.1260×1000250                                                      =8×10-3     ∅=8×10-32×10-2=0.4
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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 27oC. The buffer capacity of the solution is