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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)+log2`

Text Solution

Verified by Experts

The correct Answer is:
D
Total moles of sodium acetate
`0.1+0.1=0.2`
`pH=pK_(a)+"log"([CH_(3)COONa])/([CH_(3)COOH])`
`pH=pK_(a)+"log"(0.2)/(0.1)=pK_(a)+log2`.
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