Work 2: Measuring pK1 for glycineK1 of an ampholite can be calculated by measuring the pH of a solution with well-known ampholite (CA)and acid (cacid) concentrations.• Use 25 cm3 beakers to prepare the following three solutions:Table 1Serial Number:#1#2#30.2 M glycine solution, cm³ 50.01 M HCI solution, cm³101515105pH obtained4.224.394.50• Calibrate the electrode with a pH = 4.00 buffer (knob buffer 1). Measure the pH of each solution thencalculate [H3O+], ÇA cacid and finally K1 using equation (5).• Average the three values.Process (1) happens in acidic solutions, where deprotonation of A-is neglicted. Ki can becalculated based on a titration of glycine with a strong acid. In the following derivation,the total concentration of glycine is indicated as ca, the concentration of the acid (titrant)is Cacid. In this case:CA = [A*]+ [A*][H;O"] + [A*](3)Cacid%3D(4)By combining equations (1) (3) and (4):[H,O*](ca - c,cid +[H;O*])Cacid - [H,O*]K,(5)Based on this formula, Kı can be calculated by measuting the pH of a glycine solutionwith well-known ca and cacid.For the second deprotonation process of glycine:

Work 2: Measuring pK1 for glycine K1 of an ampholite can be calculated by measuring the pH of a solution with well-known ampholite (CA) and acid (cacid) concentrations. • Use 25 cm3 beakers to prepare the following three solutions: Table 1 Serial Number: #1 #2 #3 0.2 M glycine solution, cm³ 5 0.01 M HCI solution, cm³ 10 15 15 10 5 pH obtained 4.22 4.39 4.50 • Calibrate the electrode with a pH = 4.00 buffer (knob buffer 1). Measure the pH of each solution then calculate [H3O+], ÇA, cacid and finally K1 using equation (5). Average the three values.

Work 2: Measuring pK1 for glycine K1 of an ampholite can be calculated by measuring the pH of a solution with well-known ampholite (CA) and acid (cacid) concentrations. • Use 25 cm3 beakers to prepare the following three solutions: Table 1 Serial Number: #1 #2 #3 0.2 M glycine solution, cm³ 5 0.01 M HCI solution, cm³ 10 15 15 10 5 pH obtained 4.22 4.39 4.50 • Calibrate the electrode with a pH = 4.00 buffer (knob buffer 1). Measure the pH of each solution then calculate [H3O+], ÇA, cacid and finally K1 using equation (5). Average the three values.

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter15: Additional Aqueous Equilibria

Section: Chapter Questions

Problem 109QRT: The grid has six lettered boxes, each of which contains an item that may be used to answer the...

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