1.

A hydrogen electrode placed in a buffer solution of CH_(3)COONa and CH_(3)COOH in the ratios of x:y and y:x has electrode potential values E_(1) volts and E_(2) volts, respectively at 25^(@)C The pK_(a) values of acetic acid is (E_(1) and E_(2) are oxidation potential)

Answer»

`(E_(1)+E_(2))/(0.118)`
`(E_(2)-E_(1))/(0.118)`
`-(E_(1)+E_(2))/(0.118)`
`(E_(1)-E_(1))/(0.118)`

SOLUTION :`E_(1)=(-0.059)/(1)log[H^(+)]`
or `pH_(1)=E_(1)//0.059=pK_(a)+log((X)/(y))`
`pH_(2)=E_(2)//0.059=pK_(a)+log((y)/(x))`
or `(E_(1)+E_(2))/(0.059)=2pK_(a)` or `pK_(a)=(E_(1)+E_(2))/(0.118)`


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