Sketch the expected pH titration curve (pH on y-axis, equivalents of OHadded on the x-axis) for the amino acid tyrosine. For the purposes of this exercise assume you are titrating the fully protonated form of tyrosine with 1 M sodium hydroxide.

A. What is the principal molecular species after the addition of 2 equivalents of hydroxide ion? (Draw a proper chemical structure.)

B. What is the expected pI of tyrosine? (Explain how you arrived at your answer.)

C. What is the expected pH of the solution after the addition of 1.8 equivalents of hydroxide ion?