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A buffer solution contains 0.1 mol each ...

A buffer solution contains `0.1` mol each of `NaCH_(3)COO` and `CH_(3)COOH`. On diluting the solution to double its volume, the pH of the solution

A

will because half

B

will remain unchanged

C

will be doubled

D

cannot be predicted

Text Solution

Verified by Experts

The correct Answer is:
B
According to the Henderson equation, pH of the acidic buffer is given as
`pH = pK_(a)+"log" (["salt"])/(["acid"])`
On dilution (addition of more of solvent, `H_(2)O`), the value of `K_(a)` does not change and the ratio `["salt"]//["acid"]` remains unchanged as both `["salt"]` and `["acid"]` will change on dilution.
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