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Buffer Solutions

10 mL of 2 M ...

Question

$10 mL$ of $2 M$ acid is added to $250 mL$ of a buffer solution with $p H = 6.34$ and the $p H$ of the solution becomes $6.32$ . The buffer capacity of the solution is:

A

1

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B

2

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C

3

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D

4

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Solution

The correct option is D $4$
$Buffer capacity = \frac{moles of acid or base added per litre}{change in pH} Buffer capacity = \frac{\frac{2 \times 10}{1000} \times \frac{1000}{250}}{6.34 - 6.32} = 4$

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