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Q.

50 ml of 0.1M solution of sodium acetate and 50 ml of 0.01M acetic acid are mixed. The pKa of acetic acid is 4.76. The pH of the buffer solution is

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a

5.76

b

9.24

c

3.76

d

4.76

answer is C.

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Detailed Solution

pH=pKa+logSaltAcid

= 4.76 + log 50×0.150×0.01

=4.76+log(101)

=4.76+1=5.76

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