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10 ml of 0.2 M acid is added to 250 m...

10 ml of 0.2 M acid is added to 250 ml of a buffer solution with pH = 6.34 and the pH of the solution becomes 6.32 . The buffer capacity of the solution is :

A

`0.1`

B

`0.2`

C

`0.3`

D

`0.4`

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