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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: zazjaju on November 28, 2010, 03:02:23 PM

Title: Fraction of Ethylene diamine that exists in the +1 State at pH= 8.0?
Post by: zazjaju 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!

Title: Re: Fraction of Ethylene diamine that exists in the +1 State at pH= 8.0?
Post by: ardbeg on November 28, 2010, 11:20:57 PM

1) what is the pka of ethylene diamine?

Title: Re: Fraction of Ethylene diamine that exists in the +1 State at pH= 8.0?
Post by: zazjaju 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

Title: Re: Fraction of Ethylene diamine that exists in the +1 State at pH= 8.0?
Post by: Borek on November 29, 2010, 04:33:29 AM

page is about indicators, but it applies here:

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