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April 21, 2014

Homework Help: Chemistry

Posted by Meenaakshi on Tuesday, April 10, 2012 at 11:25am.

Dr.Bob,

Arrange these acids in terms of increasing acidity:
CH3COOH, NH3+CH2COOH, CH3CONHCH2COOH

According to my Chem textbook,NH3+CH2COOH has a low pKa value since both the COOH & NH3+ are protonated,so it is most acidic. CH3COOH is a weak acid, but I'm not sure about the N-acetylglycine.Dr.Bob said earlier that I had the order reversed,which means CH3COOH is most acidic among all three. Hope Dr.Bob can explain why my assumptions went wrong.
Thank you

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