Q.

The buffer capacity of a buffer having 0.1 M acetic acid and 0.05 M sodium acetate is

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a

0.0333 M

b

0.2304 M

c

0.0768 M

d

0.1152 M

answer is B.

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Detailed Solution

By definition, buffer capacity of an acidic buffer is

b(pH)=2.303b(ab)a

where  a=[ acid ]+[ salt ] and b=[ salt ].hence 

b(pH)=2.303(0.05 M)(0.1 5 M0.05 M)(0.15 M)=0.0768 M

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The buffer capacity of a buffer having 0.1 M acetic acid and 0.05 M sodium acetate is