3. The measurement of F- ion concentration by ion-selective electrodes at 25.00°C obeys the equation Emeasured = Ereference – 0.05916 log10 [F-] a) For a given solution, Emeasured is 0.4462 V. If Ereference is 0.2420 V, what is the concentration of F- in the solution? b) At low pH, [F-] is mostly converted to HF. The fluoride electrode does not respond to HF. What is the minimum pH at which 99% of the fluoride is present as F- and only 1% is present as HF?

3. The measurement of F- ion concentration by ion-selective electrodes at 25.00°C obeys the equation Emeasured = Ereference – 0.05916 log10 [F-] a) For a given solution, Emeasured is 0.4462 V. If Ereference is 0.2420 V, what is the concentration of F- in the solution? b) At low pH, [F-] is mostly converted to HF. The fluoride electrode does not respond to HF. What is the minimum pH at which 99% of the fluoride is present as F- and only 1% is present as HF?

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

3. The measurement of F- ion concentration by ion-selective electrodes at 25.00°C
obeys the equation
Emeasured = Ereference – 0.05916 log10 [F-]
a) For a given solution, Emeasured is 0.4462 V. If Ereference is 0.2420 V, what is the
concentration of F- in the solution?
b) At low pH, [F-] is mostly converted to HF. The fluoride electrode does not respond
to HF. What is the minimum pH at which 99% of the fluoride is present as F- and
only 1% is present as HF?

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