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The pH of an acid buffer can be raised b...

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

B

Increasing the concentration of both the acid and salt by 10 times.

C

Diluting the solution by 10 times.

D

Increasing the concentration of the salt by 10 times and decreasing concentration of the acid by 10 times.

Text Solution

Verified by Experts

The correct Answer is:
D
`pH_(1) = pK_(a) + log(("Salt")/("Acid"))`
`pH_(1) = pK_(a) + log((x_(1))/(y_(1)))`
`pH_(2) = pK_(a) + log ((x_(2))/(y_(2)))`
`pH_(2) - pH_(1) = log""(x_(2))/(y_(2)) - log""(x_(1))/(y_(1))`
`2 = log((x_(2)//y_(2))/(x_(1)//y_(1)))`
`therefore (x_(2)//y_(2))/(x_(1)//y_(1)) = 10^(2) = 100`
This is only possible, if the concetration of salt is increased by 10 times and the concentration of acid is decreased by 10 times.
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