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Author Topic: degree of ionization  (Read 11141 times)

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profmsg

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degree of ionization
« on: December 28, 2006, 09:10:19 AM »

hey
anybody know how to calculate the degree of ionization at pka 3 and ph 4
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Borek

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Re: degree of ionization
« Reply #1 on: December 28, 2006, 09:16:59 AM »

Please read forum rules.

Calculate pH, assume [A-] = [H+] and use degree of dissociation definition.
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profmsg

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Re: degree of ionization
« Reply #2 on: December 28, 2006, 09:21:48 AM »

can u calculate the degree of ionization of codeine at pka8.2 in the solution of ph 2
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Borek

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Re: degree of ionization
« Reply #3 on: December 28, 2006, 09:44:36 AM »

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.

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).
« Last Edit: December 28, 2006, 09:51:43 AM by Borek »
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chiralic

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Re: degree of ionization
« Reply #4 on: December 29, 2006, 01:20:53 AM »

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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Borek

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Re: degree of ionization
« Reply #5 on: December 29, 2006, 06:00:03 AM »

Well, when it comes to links, pH calculation lectures are much more complete :)
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