Creatine C 4 H 9 N 3 O 2 has been used by body builders and athletes

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Creatine C4H9N3Ohas been used by body builders and athletes to increase muscle mass and strength. Its chemical structure (not showing all of its carbon atoms and attached hydrogens) is

0. OH N NH

The following values are known for its dissociation constants: 

pK = 2.63 and pK = 14.30

a. Determine the charge on this amino acid as a function of pH. 

b. Find its isoelectric point.

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