Draw aspartic add (aspartate) at pH 1, pH 7. and pH 13. Include hydrogen atoms. 
pH 1 pH 7 X X  
O HO ig \cANc/\ te H p i H ii4NH 
H 11 Ne2 / A c 
 

1.

In aspartic acid, the pKa? of carboxyl group is 2.09, pKa? of amino group is 9.82 and the pKa? of side chain is 3.86.

Here, the pH is 1.

Explanation | Common mistakes | Hint for next step

The pH is less than the }pKa? of carboxyl group (2.09). The pH is less than pKa? of amino group (9.82). The pH is less than the pKa? of side chain (3.86).

2.Explanation | Hint for next step

The pH is less than the }pKa? of carboxyl group (2.09). So, the carboxyl group is protonated (-COOH)

The pH is less than the {}pKa? of amino group (9.82). So, the amino group is protonated ( -_3}^ +−NH3?+ ).

The pH is less than the pKa? of side chain (3.86). So, the side chain is protonated (-COOH)

3.

In aspartic acid, the {\rm{p}}{K_{\rm{a}}}pKa? of carboxyl group is 2.09, {\rm{p}}{K_{\rm{a}}}pKa? of amino group is 9.82 and the {\rm{p}}{K_{\rm{a}}}pKa? of side chain is 3.86.

Here, the pH is 7.

Explanation | Common mistakes | Hint for next step

The pH is greater than the pKa? of carboxyl group (2.09). The pH is less than thepKa? of amino group (9.82). The pH is greater than thepKa? of side chain (3.86).

4.Explanation | Hint for next step

The pH is greater than the pKa? of carboxyl group (2.09). So, the carboxyl group is deprotonated and contains a negative charge.

The pH is less than thepKa? of amino group (9.82). So, the amino group is protonated and contains a positive charge.

The pH is greater than the pKa? of side chain (3.86). So, the side chain is deprotonated and contains a negative charge.

5.Explanation | Common mistakes | Hint for next step

The pH is greater than thepKa? of carboxyl group (2.09). The pH is greater than the pKa? of amino group (9.82). The pH is greater than thepKa? of side chain (3.86).

6.Explanation

The pH is greater than the pKa? of carboxyl group (2.09). So, the carboxyl group is deprotonated and contains a negative charge.

The pH is greater than the}pKa? of amino group (9.82). So, the amino group is deprotonated.

The pH is greater than thepKa? of side chain (3.86). So, the side chain is deprotonated and contains a negative charge.

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