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Alanine Is a Diprotic Amino Acid with a PKa =

Question 12

Multiple Choice

Alanine is a diprotic amino acid with a pKa = 2.344 for the carboxylic group and a pKa = 9.868 for the ammonium group.At pH = 6.32,what is the principal species in solution?


A) H2L+
B) L−
C) HL
D) H3L2+
E) L2−

Correct Answer:

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