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Buffer Solutions

When 36.5 g o...

Question

When $36.5 g$ of $H C l$ is added to $1 L$ of an acidic buffer solution, its $p H$ changes from 4 to 3. The buffer capacity of the buffer 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 A 1
Buffer capacity :
It is defined as the moles of a strong acid or strong base required to change the pH of 1 L of a buffer by one unit.

Moles of HCl is : $\frac{Mass}{Molar mass} = \frac{36.5}{36.5} = 1 m o l$

$Buffer capacity = \frac{Number of moles of acid or base added to a 1L buffer}{Change in pH} Buffer capacity = \frac{1}{4 - 3} = 1$

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