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Q.

The hydrogen electrode when placed in a buffer solution of CH3COONa and CH3COOH in the ratio x:y and y:x has oxidation electrode potential E1 and E2 volts respectively at 25°C (pH2 = 1 atm). pKa for CH3COOH will be :

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a

E1−E2/0.0591×2

b

E1+E2/0.0591×2

c

E1−E2

d

E1+E2

answer is C.

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Detailed Solution

E=E0−(0.0591/1)log⁡1/H++E1/0.0591=PKa+log⁡x/y----(1)+E2/0.0591=PKa+log⁡y/x----(2) from (1) \& (2) PKa=+E1+E2/2×0.0591

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