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Buffer Solutions

When 73 g of ...

Question

When $73 g$ of $H C l$ is added to $1 L$ of an acidic buffer solution, its $p H$ changes from 3.4 to 2.9. The buffer capacity of the buffer is:

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Solution

The correct option is C 4
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 : $\frac{Mass}{Molar mass} = \frac{73}{36.5} = 2 m o l$

$Buffer capacity = \frac{Number of moles of acid or base added to a 1L buffer}{Change in pH} Buffer capacity = \frac{2}{3.4 - 2.9} = 4$

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Buffer Solutions

Standard XII Chemistry

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When 73 g of HCl is added to 1 L of an acidic buffer solution, its pH changes from 3.4 to 2.9. The buffer capacity of the buffer is:

When $73 g$ of $H C l$ is added to $1 L$ of an acidic buffer solution, its $p H$ changes from 3.4 to 2.9. The buffer capacity of the buffer is: