Titration Curve for Amino Acid

Shown below is a potentiometric titration curve for a 0.050-g sample of an amino acid dissolved in water and titrated with 0.100 M NaOH. Based on this titration curve, answer the following questions:

(a) How many titratable acid/base sites does the amino acid have?

(b) Estimate the pKa for each of the acid-base sites you  identified.

(c) Estimate the gram equivalent weight of the amino acid?

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