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A buffer solution contains 0.1 mole of s...

A buffer solution contains 0.1 mole of sodium acetate dissolved in `1000 cm^(3)` of 0.1 M acetic acid. To the above buffer solution, 0.1 mole of sodium acetate is further added and dissolved. The pH of the resulting buffer is

A

`pK_(a)-log2`

B

`pK_(a)`

C

`pK_(a)+2`

D

`pK_(a)+log2`

Text Solution

Verified by Experts

The correct Answer is:
D
pH of an acidic buffer `= pK_(a)+"log"(["Salt"])/(["Acid"])`
Here, [Salt] = 0.2 M and [Acid] = 0.1 M.
`therefore pH = pK_(a)+"log"(0.2)/(0.1)=pK_(a)+log 2`
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