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The hydrogen ion concentration of a buff...

The hydrogen ion concentration of a buffer solution consisting of a week acid and its salts is given by

A

`[H^(+)]=(K_(a)["acid"])/(["salt"])`

B

`[H^(+)]=K_(a)["salt"]`

C

`[H^(+)]=K_(a)["acid"]`

D

`[H^(+)]=(K_(a)["salt"])/(["acid"])`

Text Solution

Verified by Experts

According to Henderson equation
`pH=pK_(a)+"log"(["Salt"])/(["Acid"])`
`i.e. -log[H^(+)]=-logK_(a)+"log"(["Salt"])/(["Acid"])`
`-log[H^(+)]="log"(["salt"])/(["acid"])xx(1)/(K_(a))`
`"log"(1)/([H^(+)])="log"(["salt"])/(["acid"])xx(1)/(K_(3))`
`therefore [H^(+)]=K_(a)(["salt"])/(["acid"])`
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