2 A student determined the concentration of a weak acid, acetic acid, by a titrimetric method using a standard NaOH solution and a pH meter for end point detection. Table 1.0 below shows the data that was obtained by the student. Table 1.0: Potentiometric titration of acetic acid with 0.100 M standard NaOH solution Burette Reading Volume of NaOH added (mL) pH reading 11.54 0 3.14 12.25 0.71 3.70 13.40 1.86 4.16 16.59 5.05 4.77 17.50 5.96 4.93 19.35 7.81 5.24 20.41 8.87 5.49 21.00 9.46 5.68 21.60 10.06 5.96 21.83 10.29 6.14 22.01 10.47 6.34 22.12 10.58 6.48 22.20 10.66 6.68 22.30 10.76 6.97 22.38 10.84 7.73 22.41 10.87 9.21 22.49 10.95 10.04 22.55 11.01 10.57 22.61 11.07 10.83 23.00 11.46 11.35 23.31 11.77 11.62 23.71 12.17 11.76 24.30 12.76 11.89 25.20 13.66 12.03 Plot a curve of pH versus the volume of NaOH and determine the end point a.

2 A student determined the concentration of a weak acid, acetic acid, by a titrimetric method using a standard NaOH solution and a pH meter for end point detection. Table 1.0 below shows the data that was obtained by the student. Table 1.0: Potentiometric titration of acetic acid with 0.100 M standard NaOH solution Burette Reading Volume of NaOH added (mL) pH reading 11.54 0 3.14 12.25 0.71 3.70 13.40 1.86 4.16 16.59 5.05 4.77 17.50 5.96 4.93 19.35 7.81 5.24 20.41 8.87 5.49 21.00 9.46 5.68 21.60 10.06 5.96 21.83 10.29 6.14 22.01 10.47 6.34 22.12 10.58 6.48 22.20 10.66 6.68 22.30 10.76 6.97 22.38 10.84 7.73 22.41 10.87 9.21 22.49 10.95 10.04 22.55 11.01 10.57 22.61 11.07 10.83 23.00 11.46 11.35 23.31 11.77 11.62 23.71 12.17 11.76 24.30 12.76 11.89 25.20 13.66 12.03 Plot a curve of pH versus the volume of NaOH and determine the end point a.

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter15: Complex Acid/base Systems

Section: Chapter Questions

Problem 15.26QAP

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