pKa of acetic acid

A hydrogen electrode placed in a buffer solution of CH3COONa and CH3COOH in the ratios of x:y and y:x has electrode potential(oxidation) E1 volts and E2 volts respectively at 25°C. what is the pKa of acetic acid?

8 Answers

3
msp ·

is it (E1+E2)/2

13
Двҥїяuρ now in medical c ·

ans is.....E1+E2/0.118

13
Двҥїяuρ now in medical c ·

help yaaroo....

13
Двҥїяuρ now in medical c ·

no one trying to solve this??!!!

1
skygirl ·

arey i had tried this long back wen u posted ...

ok aur ek bar try karte hai :P

1357
Manish Shankar ·

(1/2)H2→H++e-

E1=-0.059log[H+]

E1=-0.059log{yKa/x}

E2=-0.059log{xKa/y}

adding both

(E1+E2)/0.059=-2logKa

pKa=(E1+E2)/0.118

1
rahul wadhwani ·

if u dont want 2 solve their is big shortcut many reputated exams which take accurate data then take -log(1.8*10-5)....

1
skygirl ·

oh great bhaiya .. thanx...

was wondering hw to do this....

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