5. An analyst at Procter & Gamble quality control department received a sample of toothpaste to determine the %fluoride. The analyst prepared a series of fluoride calibration standards and a total ionic strength adjusting buffer (TISAB) to standardize the fluoride electrode. The results of the potential measurements of the calibration standards are depicted on the figure. The analyst dissolved 0.2364 g of the toothpaste in 100 ml of DI water containing the TISAB. Then, measured the potential of the toothpaste solution to be-170 mv. -100 -200 10 lewe d - Estimate the linear concentration range of this fluoride selective electrode. Peal chang, V

5. An analyst at Procter & Gamble quality control department received a sample of toothpaste to determine the %fluoride. The analyst prepared a series of fluoride calibration standards and a total ionic strength adjusting buffer (TISAB) to standardize the fluoride electrode. The results of the potential measurements of the calibration standards are depicted on the figure. The analyst dissolved 0.2364 g of the toothpaste in 100 ml of DI water containing the TISAB. Then, measured the potential of the toothpaste solution to be-170 mv. -100 -200 10 lewe d - Estimate the linear concentration range of this fluoride selective electrode. Peal chang, V

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter11: Dynamic Electrochemistry

Section: Chapter Questions

Problem 10P

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Similar questions

A 0.0712-g sample of a purified organic acid was dissolved in an alcohol-water mixture and titrated with coulometrically generated hydroxide ions. With a current of 0.0392 A, 241 s was required to reach aphenolphthalein end point. Calculate the equivalent mass of the acid.
Halide ions can he deposited at a silver anode, the reaction being Ag(s) + X- AgX(s) +e- Suppose that a cell was formed by immersing a silver anode in an analyte solution that was 0.0250 M Cl-,Br-, and I -ions and connecting the half-cell to a saturated calomel cathode via a salt bridge. (a) Which halide would form first and at what potential? Is the cell galvanic or electrolytic? (b) Could I- and Br- be separated quantitatively? (Take 1.00 l0-5 M as the criterion for quantitative removal of an ion.) If a separation is feasible, what range of cell potential could he used? (c) Repeat part (b) for I- and Cl-. (d) Repeat part (b) for Br- and Cl-.
The measurement of pH using a glass electrode obeys the Nernst equation. The typical response of a pH meter at 25 00C is given by the equation where contains the potential of the reference electrode and all other potentials that arise in the cell that are not related to the hydrogen ion concentration. Assume that = 0.250 V and that a. What is the uncertainty in the values of pH and [H+] if the uncertainty in the measured potential is 1 m V ( 0.001 V)? b. To what precision must the potential be measured for the uncertainty in pH to be 0.02 pH unit?
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