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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 `1000cm^(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)-log 2`

B

`pK_(a)`

C

`pK_(a)+2`

D

`pK_(a)+log2`

Text Solution

Verified by Experts

The correct Answer is:
D
`pH_("Initial") = pK_(a) +log. (["Salt"])/(["Acid"])`
`pH _("Initial")=pK_(a) + log. ((0.1))/((0.1))`
`pH_("Initial") = pK_(a)`
`pH _("final") =pK_(a) + log. ((0.2))/((0.1))`
`pH_("final")= pK_(a)+log 2 `.
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