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Topic: Fraction of Ethylene diamine that exists in the +1 State at pH= 8.0?  (Read 4136 times)

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Offline zazjaju

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Fraction of Ethylene diamine that exists in the +1 State at pH= 8.0?
« on: November 28, 2010, 03:02:23 PM »
What is the fraction of ethylene diamine that exists in the +1 state at pH=8.0?

Please remember that Ethylene is not EDTA... these two are different things.

Struggling understanding the concepts, and would like somebody to help solve this.... thank you!
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Offline ardbeg

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Re: Fraction of Ethylene diamine that exists in the +1 State at pH= 8.0?
« Reply #1 on: November 28, 2010, 11:20:57 PM »
1) what is the pka of ethylene diamine?
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Offline zazjaju

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Re: Fraction of Ethylene diamine that exists in the +1 State at pH= 8.0?
« Reply #2 on: November 28, 2010, 11:47:29 PM »
the pKa of ethylene diamine is 6.848. The corresponding Ka is 1.42 x 10^-7
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Offline Borek

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Re: Fraction of Ethylene diamine that exists in the +1 State at pH= 8.0?
« Reply #3 on: November 29, 2010, 04:33:29 AM »
page is about indicators, but it applies here:

http://www.titrations.info/acid-base-titration-indicators
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