1.

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

Answer»

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

Solution :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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