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Topic: Dissociation degree calculation from Ka1 Ka2 and H+  (Read 3493 times)

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Offline willy.Jonathan.12

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Dissociation degree calculation from Ka1 Ka2 and H+
« on: September 02, 2014, 05:41:31 PM »
Hello
My task is to express dissociation degree for fully dissociated form of diprotoic acid in general as a function of Ka1 Ka2 and [H+].

I know that
Ka1=[H+]*[HA-]/[H2A]
Ka2=[H+]*[A2-]/[HA-]
[HA-]+[A2-]=[H+]

diss degree=[A2-]/(HA-]+[H2A]+[A2-])

But I have no idea how to exchange all this things with only Ka1 Ka2 and [H+]
Can someone help me with that ?

Offline Borek

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Re: Dissociation degree calculation from Ka1 Ka2 and H+
« Reply #1 on: September 02, 2014, 06:16:01 PM »
See

http://www.chembuddy.com/?left=pH-calculation&right=pH-polyprotic-acid-base

(while it aims at something else, it contains all formulas you need).
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info

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