First slide

Buffer Capacity

Question

pH of a buffer solution decreases by 0.02 units when 0.12g of acetic acid is added to 250 ml of a buffer solution of acetic acid and potassium acetate at 27⁰C. The buffer capacity of the solution is ?

Moderate

A

0.1
B

10
C

1
D

0.4

Solution

0.02 unit change of P^H occurs when 0.12/60
mol of acid is added to 250 ml of buffer solution.
Therefore, 0.02 unit change of P^H occurs when 4( 2x 10^-3)
moles of acid is added to 1000 ml of buffer solution .
Therefore ,1unit change in P^Hoccurs, when moles of acid added to 1000 ml of solution=........?
= $\frac{4 \times 2 \times 10^{- 3}}{2 \times 10^{- 2}}$ = 0.4

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