Glycine, the simplest amino acid, has both an acid group and a basic group in its structure (H,N-CH2-COOH). In aqueous solution it exists predominantly as a self-neutralized species called a zwitterion (H3 Ñ–CH,–CO0"). The zwitterion therefore behaves both as an acid and as a base, according to the equilibria at 25°C: H;N —CH—СОО (аg) + Н,0(€) — H,N-CH2-COO (aq) + H3O* (aq) K, = 1.7 × 10-10 H,N —CH,—СОО (ад) + Н,0() — Н;N—CH, —CООНҢ(ag) + ОН (ад) К, — 2.2 х 1о-12 Calculate the pH of a 0.10 M aqueous solution of glycine at 25°C. (Hint: You may need to take account of the autoionization of water.)

Glycine, the simplest amino acid, has both an acid group and a basic group in its structure (H,N-CH2-COOH). In aqueous solution it exists predominantly as a self-neutralized species called a zwitterion (H3 Ñ–CH,–CO0"). The zwitterion therefore behaves both as an acid and as a base, according to the equilibria at 25°C: H;N —CH—СОО (аg) + Н,0(€) — H,N-CH2-COO (aq) + H3O* (aq) K, = 1.7 × 10-10 H,N —CH,—СОО (ад) + Н,0() — Н;N—CH, —CООНҢ(ag) + ОН (ад) К, — 2.2 х 1о-12 Calculate the pH of a 0.10 M aqueous solution of glycine at 25°C. (Hint: You may need to take account of the autoionization of water.)

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter13: Acids And Bases

Section: Chapter Questions

Problem 58QAP: Consider citric acid, H3C6H5O7, added to many soft drinks. The equilibrium constants for its...

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