First slide

Buffer Capacity

Question

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 $27^{o} C$ . The buffer capacity of the solution is

Moderate

A

0.1
B

10
C

1
D

0.4

Solution

Buffer capacity, $\emptyset = \frac{No.of molesof acid added/lit}{{Change in P}^{H}}$
$No . of moles of acetic acid / lit = \frac{0.12}{60} \times \frac{1000}{250} = 8 \times 10^{- 3} \emptyset = \frac{8 \times 10^{- 3}}{2 \times 10^{- 2}} = 0.4$

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