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Question

The pH of an acid buffer can be raised by 2 units by:

A
Increasing the concentration of both weak acid and salt by two moles
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B
Increasing the concentration of both the acid and salt by 10 times
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C
Diluting the solution by 10 times
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D
Increasing the concentration of the salt by 10 times and decreasing concentration of the acid by 10 times
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Solution

The correct option is D Increasing the concentration of the salt by 10 times and decreasing concentration of the acid by 10 times
For an acidic buffer solution, we use the Henderson-Hasselbalch equation
Or
pH=pKa+log[salt][acid]
So Case I
pH1=pKa+log[salt1][acid1]....(1)
So Case 2
pH2=pKa+log[salt2][acid2]....(2)
According to question,
(2)-(1) =2; pKa terms will get cancelled we get
2 = log[acid1]×[salt2][salt1]×[acid2]
taking antilog and solving
[acid1]×[salt2][salt1]×[acid2]=102
When the concentration of salt is increased by 10 times and concentration of acid is decreased by 10 times, then we get this ratio.

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