A new amino acid has 2 carboxyl groups. the pka's of these groups are 2.18 and 5.02. The amino acid has one amino group with a pka of 9.98.   a) What is the pI of the amino acid?

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A new amino acid has 2 carboxyl groups. the pka's of these groups are 2.18 and 5.02. The amino acid has one amino group with a pka of 9.98.

 
a) What is the pI of the amino acid?
 
b) The number of end points I expect to see on a titration curve is ___ and the first buffer region would be centered around a pH of ___. The total number of buffer regions is ___.
 
c) What is the pka of the side chain? 
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