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In a mixture of weak acid and its salt, ...

In a mixture of weak acid and its salt, the ratio of concentration of acid to salt is increased ten-fold. The pH of the solution

A

Decreases by one

B

Increases by one-tenth

C

Increases by one

D

Increases ten-fold

Text Solution

Verified by Experts

The correct Answer is:
A
It is buffer solution so ,
`pH = pK_(a)+log. ("Salt")/("Acid")`
`pH = pK_(a)- log . ("Acid")/("Salt")" " ("Given "(["Acid"])/(["Salt"]) =10:1)`
`pH = pK_(a) - log 10 `
`pH = pK_(a)- 1 `
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