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Author: Subject: Question about Sorensen formol titration of glycine
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[*] posted on 1-10-2013 at 14:00
Question about Sorensen formol titration of glycine


I want to know what is the importance of adding sodium hydroxide to glycine before addition of neutralized formaldehyde to it.

In the attached method, the book says that NaOH removes a hydrogen ion from the NH3+ group to be able to react with fromaldehyde. But in this case the resultant product is a carboxylate ion NH2CH2COO- when reacted with formaldehyde also the product is carboxylate ion CH2=NCH2COO-. How can I titrate this ion as acid with standard NaOH?


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