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 an ion-selective electrode with a Ag-AgCl(sat'd) reference electrode 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 mass percent- age of 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 an ion-selective electrode with a Ag-AgCl(sat'd) reference electrode 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 mass percent- age of 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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Transcribed Image Text:*23-26 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 an ion-selective electrode with
a Ag-AgCl(sat'd) reference electrode 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 mass percent-
age of F in the sample.
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