A 0.400-g sample of toothpaste was boiled with a 50-mL solution containing a citrate buffer and NaCl to extract the fluoride ion. After cooling, the solution was diluted to exactly 100 mL. The potential of a selective ion/calomel system in a 25.0-mL aliquot of the sample was found to be - 0.1823 V. Addition of 5.0 mL of a solution containing 0.00107 mg F-/mL caused the potential to change to 0.2446 V. Calculate the weight percent F- in the sample.

A 0.400-g sample of toothpaste was boiled with a 50-mL solution containing a citrate buffer and NaCl to extract the fluoride ion. After cooling, the solution was diluted to exactly 100 mL. The potential of a selective ion/calomel system in a 25.0-mL aliquot of the sample was found to be - 0.1823 V. Addition of 5.0 mL of a solution containing 0.00107 mg F-/mL caused the potential to change to 0.2446 V. Calculate the weight percent F- in the sample.

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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Concept explainers

Potentiometric Titrations

Potentiometric titration is one of the important titration methods and is mainly carried out to characterize acid solutions. It follows a method similar to that of the normal titration technique, but the main difference is that there is no indicator used in the potentiometric titrations. Instead of using an indicator, electrodes are employed for monitoring the whole titration process. A scientist named Robert Behrend did the potentiometric titration for the first time, and it was done using the mercurous solution and potassium chloride.

Question

A 0.400-g sample of toothpaste was boiled with a 50-mL
solution containing a citrate buffer and NaCl to extract the
fluoride ion. After cooling, the solution was diluted to
exactly 100 mL. The potential of a selective ion/calomel
system in a 25.0-mL aliquot of the sample was found to be -
Addition of 5.0 mL of a solution containing
0.00107 mg F-/mL caused the potential to change to -
0.2446 V. Calculate the weight percent F-in the sample.
0.1823 V.

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