A student was asked to determine the purity of sodium thiosulfate, Na2S2O3 sample by coulometric titration. Oxidation of thiosulfate involves one electron. Gerald prepared a 50 mL solution with 0.1132 g crude sample. A 10 mL aliquot was pipetted along with KI and phosphate buffer. Starch powder was used as indicator. Titration process took 221 seconds to achieve end point under constant current of 38.45 mA. Determine the purity of sodium thiosulfate (158.1 g/mol) crude sample. (F=96485 C/mol e

A student was asked to determine the purity of sodium thiosulfate, Na2S2O3 sample by coulometric titration. Oxidation of thiosulfate involves one electron. Gerald prepared a 50 mL solution with 0.1132 g crude sample. A 10 mL aliquot was pipetted along with KI and phosphate buffer. Starch powder was used as indicator. Titration process took 221 seconds to achieve end point under constant current of 38.45 mA. Determine the purity of sodium thiosulfate (158.1 g/mol) crude sample. (F=96485 C/mol e

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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Question

A student was asked to determine the purity of sodium thiosulfate, Na2S2O3 sample by coulometric
titration. Oxidation of thiosulfate involves one electron. Gerald prepared a 50 mL solution with 0.1132 g
crude sample. A 10 mL aliquot was pipetted along with KI and phosphate buffer. Starch powder was used
as indicator. Titration process took 221 seconds to achieve end point under constant current of 38.45 mA.
Determine the purity of sodium thiosulfate (158.1 g/mol) crude sample. (F= 96485 C/mol e)I

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