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September 15, 2014

Homework Help: chem -please help!!!!!!!!!!!!

Posted by ron on Monday, September 10, 2012 at 11:12pm.

An unknown compound, X, is though to have a carboxyl group with a pKa of 2.0 and another ionizable group with a pKa between 5 and 8. When 75 mL of 0.1M NaOH is added to 100 mL of a 0.1M solution of X at pH 2.0, the pH increases to 6.72. Calculate the pKa of the second ionizable group of X. Can someone please tell me how do I know that at the initial pH the carboxylic acid will be 50% dissociated?

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