Answer Happy

page 101 Exp. 13: Acid-Base Properties of Amino Acids Questions 1. The titration in this experiment involves two successive acid-base reactions. *) The first reaction is the following. Note, the form of slanine that is initially present in acidic medium. Complete the reaction. HONCHE OH OH ан, + b) The second reaction involves the reaction of the product from I. a) above with another OH. Write an equation for this second reaction. 2. a) Draw the zwitterion for the amino acid leucine. b) Draw the form of the amino acid glycine you would expect at a pH of 2 c) Draw the form of the amino acid phenyl- alanine you would expect at a pH of . 3. Some amino acids such as glutamic acid actually have three pka's rather than the two pa's of alanine. Why? 4. For neutral amino acids such as glycine, alanine, phenylalanine amd leucine the plis simply the average of the two pka's for the amino acid. If pk., for phenylalanine is 1.83 and pK 2 = 9.13, what is the value for the p/ for phenylalanine?