The ionization constant(s) and the molecular weight of a 0.542 g sample of unknown acid were determined by pH meter using Ag/AgCI as reference electrode. The unknown acid was titrated with 0.402 N NAOH and the results of the titration were tabulated below. Volume of N2OH (mL) Volume of pH Volume of pH PH NAOH (mL) NAOH (mL) 0.00 1.70 5.00 4.00 10.00 9.15 0.50 1.80 5.50 6.60 10.50 10.80 1.00 1.90 6.00 7.20 11.00 12.00 1.50 2.00 6.50 7.30 11.50 12.20 2.00 2.10 7.00 7.40 12.00 12.40 2.50 2.25 7.50 7.50 12.50 12.50 3.00 2.50 8.00 7.60 13.00 12.55 3.50 2.70 8.50 7.70 13.50 12.60 4.00 2.90 9.00 7.80 14.00 12.60 4.50 3.10 9.50 7.90 14.50 12.60 a. Using either a graphing paper, Microsoft Excel or any spreadsheet software, sketch the experimental titration curve graph b. Calculate the ionization constant(s). c. Calculate the molecular weight and equivalent weight of the unknown acid.
The ionization constant(s) and the molecular weight of a 0.542 g sample of unknown acid were determined by pH meter using Ag/AgCI as reference electrode. The unknown acid was titrated with 0.402 N NAOH and the results of the titration were tabulated below. Volume of N2OH (mL) Volume of pH Volume of pH PH NAOH (mL) NAOH (mL) 0.00 1.70 5.00 4.00 10.00 9.15 0.50 1.80 5.50 6.60 10.50 10.80 1.00 1.90 6.00 7.20 11.00 12.00 1.50 2.00 6.50 7.30 11.50 12.20 2.00 2.10 7.00 7.40 12.00 12.40 2.50 2.25 7.50 7.50 12.50 12.50 3.00 2.50 8.00 7.60 13.00 12.55 3.50 2.70 8.50 7.70 13.50 12.60 4.00 2.90 9.00 7.80 14.00 12.60 4.50 3.10 9.50 7.90 14.50 12.60 a. Using either a graphing paper, Microsoft Excel or any spreadsheet software, sketch the experimental titration curve graph b. Calculate the ionization constant(s). c. Calculate the molecular weight and equivalent weight of the unknown acid.
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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