Confirming structure of aspartic acid at PH 4

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The discussion centers on confirming the structure of aspartic acid at pH 4. The user has calculated the isoelectric point (pI) and drawn a charged structure, seeking validation from others. It is noted that at pH 4, approximately 62% of aspartic acid exists in the -1 charged form, while about 37% is neutral. Concerns are raised regarding the placement of the proton on the amine group in the drawn structure. The conversation emphasizes the importance of accurately depicting the charged and neutral forms of aspartic acid at this pH level.
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Homework Statement


Draw the structure of aspartic acid at PH 4. I calculated the PI and based on that, drew the
charged structure. If anyone can confirm that this is the correct structure.

Homework Equations


The Attempt at a Solution


I attached the structure. Thanks for any assistance.
 

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At pH 4 solution contains about 62% of -1 form, and around 37% of neutral form. But I doubt -1 form is the one you have drawn, I don't think proton is on the amine group.
 

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