Chemical Forums
Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: profmsg on December 28, 2006, 03:10:19 PM
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hey
anybody know how to calculate the degree of ionization at pka 3 and ph 4
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Please read forum rules (http://www.chemicalforums.com/index.php?page=forumrules).
Calculate pH, assume [A-] = [H+] and use degree of dissociation definition.
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can u calculate the degree of ionization of codeine at pka8.2 in the solution of ph 2
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Stop. That's what happens when you do three things at the same time. pH is given. Will take a look later.
Please don't post similar questions in separate threads - and please read forum rules (http://www.chemicalforums.com/index.php?page=forumrules).
Edit: OK. Find A/HA ratio from dissociation constant definition, express ionization degree with A and HA, then you need some simple math to get rid of A and HA (only their ratio is present in the final expression).
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Also, read this link:
http://www.raell.demon.co.uk/chem/logp/logppka.htm (check section 1.4 pKa or dissociation constant)
Regards,
Chiralic
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Well, when it comes to links, pH calculation lectures (http://www.chembuddy.com/?left=pH-calculation&right=toc) are much more complete :)