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Arrhenius Acid

The pH of a b...

Question

The pH of a buffer solution changes from 6.20 to 6.17 when 0.003 mole of acid is added to 500 mL of the buffer. The buffer capacity of the system is, therefore,

A

0.1

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B

0.3

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C

0.2

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D

0.4

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Solution

The correct option is C
0.2

$B u f f e r c a p a c i t y = {\frac{N o . o f m o l e s o f a c i d a d d e d p e r l i t e r o f b u f f e r}{C h a n g e i n p H}}$

$= \frac{0.006}{0.03} = 0.2$

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