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Q.

A buffer solution contains 0.1 mole of sodium acetate dissolved in 1000 cm3 of O.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

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a

pKa

b

pKa+2

c

pKa+log⁡2

d

pKa−log⁡2

answer is D.

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Detailed Solution

 Initially CH3COONa=0.1molCH3COOH=0.1mol  when 0.1molCH3COONa is added. CH3COONa=0.1+0.1=0.2mol pH=pKa+log⁡[salt][acid] =pKa+log⁡0.20.1 =pKa+log⁡2 CH3COOH=0.1M 

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