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Buffer Solutions

When 0.1 mole...

Question

When 0.1 mole of an acid is added to 2 lit of a buffer solution, the pH of the buffer decreases by 0.5. The buffer capacity of the solution is:

A

0.6

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B

0.4

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C

0.2

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D

0.1

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Solution

The correct option is B 0.1
$0.1$ moles of acid is added to $2 L$ of buffer solution. $p H$ of buffer decreases by $0.5$ .

We know, Buffer capacity $= \frac{N o . o f m o l e s o f a c i d o r b a s e a d d e d t o 1 l i t r e o f s o l u t i o n}{c h a n g e i n p H}$

$ϕ = \frac{\frac{0.1}{2}}{0.5}$

$ϕ = \frac{1}{10}$

$ϕ = 0.1$

buffer capacity of solution is $0.1$

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