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A hydrogen electrode X was placed in a b...

A hydrogen electrode X was placed in a buffer solution of sodium acetate and acetic acid in the ratio `a:n` and another hydrogen electode Y was placed in a buffer solution of sodium acetate and acetic acid in the ratio `b:a`. If reduction potential values for two cells are found to be `E_(1)` and `E_(2)` respectively w.r.t standard hydrogen electrode, the `pK_(a)` value of the acid can be given as:

A

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

B

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

C

`((E-(1)/E-(2)) xx 0.118`

D

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

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The correct Answer is:
B
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A hydrogen electrode X was placed in a buffer solution of sodium acetate ad acetic acid in the ratio a:b and another hydrogen electrode Y was placed in a buffer solution of sodium acetate ad acetic in the ratio b:a if reduction potential values for two cells are found to be E_(1) and E_(2) respectively w.r.t. standard hydrogen electrode, the pK_(a) value of the acid can be given as (A) (E_(1)-E_(2))/(0.118) (B). -(E_(1)+E_(2))/(0.118) (C). (E_(1))/(E_(2))xx0.118 (D). (E_(2)-E_(1))/(0.118)

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