is it (E1+E2)/2
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?
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8 Answers
skygirl
·2009-02-26 23:57:12
arey i had tried this long back wen u posted ...
ok aur ek bar try karte hai :P
Manish Shankar
·2009-02-27 02:30:09
(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
rahul wadhwani
·2009-02-27 02:37:00
if u dont want 2 solve their is big shortcut many reputated exams which take accurate data then take -log(1.8*10-5)....