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The amino acid glycine 1H2NCH2COOH2 can participate in the
Chapter , Problem 16.114(choose chapter or problem)
The amino acid glycine 1H2NCH2COOH2 can participate in the following equilibria in water: H2NCH2COOH + H2O H2NCH2COO- + H3O+ Ka = 4.3 * 10-3 H2NC + H2COOH + H2O H3NCH2COOH + OH- Kb = 6.0 * 10-5 (a) Use the values of Ka and Kb to estimate the equilibrium constant for the intramolecular proton transfer to form a zwitterion: H2NCH2COOH +H3NCH2COO (b) What is the pH of a 0.050 M aqueous solution of glycine? (c) What would be the predominant form of glycine in a solution with pH 13? With pH 1?
Questions & Answers
QUESTION:
The amino acid glycine 1H2NCH2COOH2 can participate in the following equilibria in water: H2NCH2COOH + H2O H2NCH2COO- + H3O+ Ka = 4.3 * 10-3 H2NC + H2COOH + H2O H3NCH2COOH + OH- Kb = 6.0 * 10-5 (a) Use the values of Ka and Kb to estimate the equilibrium constant for the intramolecular proton transfer to form a zwitterion: H2NCH2COOH +H3NCH2COO (b) What is the pH of a 0.050 M aqueous solution of glycine? (c) What would be the predominant form of glycine in a solution with pH 13? With pH 1?
ANSWER:Problem 16.114 The amino acid glycine (H N CH COOH) can participate in the following equilibria in water: 2 2H N CH COOH + H O H N CH COO + H O K = 4.3 x 10 - + -3 2 2 2 2 2 3 aH N CH COOH + H O H N CH COOH + OH K = 6.0 x 10 - -5 2 2 2 3 2 b(a) Use the values of Ka and Kb to estimate the equilibrium constant for the intramolecularproton transfer to form a zwitterion:H N CH COOH +H N CH COO - 2 2 3 2(b) What is the pH of a 0.050 M aqueous solution of glycine(c) What would be the predominant form of glycine in a solution with pH 13 With pH 1 Step-by-step solution Step 1 of 6 ^(A) Glycine behaves in equilibrium with H O. 2H N CH COOH + H O H N CH COO + H O Ka = 4.3 x 10 - + -3 2 2 2 2 2 3H N CH COOH + H O H N CH COOH + OH K = 6.0 x 10 - -5 2 2 2 3 2 b