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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`

B

`pK_a+2`

C

`pK_a - log 2`

D

`pK_a + log 2`

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The correct Answer is:
D
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