Glycine is a diprotic acid, which can potentially undergo two dissociation reactions, one for the a-amino group (-NH;), and the other for the carboxyl (-COOH) group. Therefore, it has two pK, values. The carboxyl group has a pKj of 2.34 and the a-amine group has a pK2 of 9.60. Glycine can exist in fully deprotonated (NH, -CH, -COO"), fully protonated (NH† -CH,-COOH), or zwitterionic form (NH;-CH,-COO-). Match the pH values with the corresponding form of glycine that would be present in the highest concentration in a solution of that pH.
Glycine is a diprotic acid, which can potentially undergo two dissociation reactions, one for the a-amino group (-NH;), and the other for the carboxyl (-COOH) group. Therefore, it has two pK, values. The carboxyl group has a pKj of 2.34 and the a-amine group has a pK2 of 9.60. Glycine can exist in fully deprotonated (NH, -CH, -COO"), fully protonated (NH† -CH,-COOH), or zwitterionic form (NH;-CH,-COO-). Match the pH values with the corresponding form of glycine that would be present in the highest concentration in a solution of that pH.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Glycine is a diprotic acid, which can potentially undergo two dissociation reactions, one for the a-amino group (–NH;), and the
other for the carboxyl (–COOH) group. Therefore, it has two pK, values. The carboxyl group has a pKj of 2.34 and the a-aminc
group has a pK2 of 9.60. Glycine can exist in fully deprotonated (NH, –CH, –COO"), fully protonated (NH† –CH, -COOH),
or zwitterionic form (NH;-CH,-CO0-).
Match the pH values with the corresponding form of glycine that would be present in the highest concentration in a solution of
that pH.
fully deprotonated form
fully protonated form
zwitterionic form
NH,–CH,-COO"
NH; –CH,-COOH
NH -CH, -COO-
Answer Bank
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