E (MV) (b) A fluoride ion selective electrode was used to analyse for fluoride as part of the QC procedures during the production of Listerine Fluoride Defense Anticavity Mouthwash. The mouthwash contains 0.02% sodium fluoride which is equivalent to 90 ppm of fluoride. The QC specification for the mouthwash is 90 ± 5 ppm of fluoride. During production three standards and six periodic samples were analysed each hour. The mouthwash samples were diluted 100 fold before the pH and ionic strength were adjusted using an appropriate TISAB before analysis. The following data was obtained for the standards and the calibration curve is shown below. Table 1. Solution E (MV) 1.00 x 10 M F 5.00 x 10-5 M F 40.5 60.2 1.00 x 10-5 M F 100.0 Figure 5. Continued... 120 -100 -80 -60 -40 -20 +o -3.5 -3.7 -3.9 -4.1 -4.3 -4.5 -4.7 -4.9 -5.1 -5.3 -5.5 Log [fluoride] (i) Six samples were analysed and the following potentials, measured in mV, were obtained; 58.9, 61.0, 60.7, 59.3, 59.6 and 61.7. Use this data to determine the fluoride concentration in the mouthwash in ppm (RAM fluoride = 19.0). (ii) Comment on whether the levels of fluoride found in the mouthwash conform to the QC specifications.
E (MV) (b) A fluoride ion selective electrode was used to analyse for fluoride as part of the QC procedures during the production of Listerine Fluoride Defense Anticavity Mouthwash. The mouthwash contains 0.02% sodium fluoride which is equivalent to 90 ppm of fluoride. The QC specification for the mouthwash is 90 ± 5 ppm of fluoride. During production three standards and six periodic samples were analysed each hour. The mouthwash samples were diluted 100 fold before the pH and ionic strength were adjusted using an appropriate TISAB before analysis. The following data was obtained for the standards and the calibration curve is shown below. Table 1. Solution E (MV) 1.00 x 10 M F 5.00 x 10-5 M F 40.5 60.2 1.00 x 10-5 M F 100.0 Figure 5. Continued... 120 -100 -80 -60 -40 -20 +o -3.5 -3.7 -3.9 -4.1 -4.3 -4.5 -4.7 -4.9 -5.1 -5.3 -5.5 Log [fluoride] (i) Six samples were analysed and the following potentials, measured in mV, were obtained; 58.9, 61.0, 60.7, 59.3, 59.6 and 61.7. Use this data to determine the fluoride concentration in the mouthwash in ppm (RAM fluoride = 19.0). (ii) Comment on whether the levels of fluoride found in the mouthwash conform to the QC specifications.
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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![E (MV)
(b)
A fluoride ion selective electrode was used to analyse for fluoride
as part of the QC procedures during the production of Listerine
Fluoride Defense Anticavity Mouthwash. The mouthwash contains
0.02% sodium fluoride which is equivalent to 90 ppm of fluoride. The
QC specification for the mouthwash is 90 ± 5 ppm of fluoride. During
production three standards and six periodic samples were analysed
each hour. The mouthwash samples were diluted 100 fold before the
pH and ionic strength were adjusted using an appropriate TISAB
before analysis. The following data was obtained for the standards
and the calibration curve is shown below.
Table 1.
Solution
E (MV)
1.00 x 10 M F
5.00 x 10-5 M F
40.5
60.2
1.00 x 10-5 M F
100.0
Figure 5.
Continued...
120
-100
-80
-60
-40
-20
+o
-3.5 -3.7 -3.9 -4.1
-4.3 -4.5 -4.7 -4.9 -5.1 -5.3 -5.5
Log [fluoride]
(i)
Six samples were analysed and the following potentials,
measured in mV, were obtained; 58.9, 61.0, 60.7, 59.3, 59.6 and
61.7. Use this data to determine the fluoride concentration in the
mouthwash in ppm (RAM fluoride = 19.0).
(ii) Comment on whether the levels of fluoride found in the
mouthwash conform to the QC specifications.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F710f496a-5063-44ba-ac6a-2a97973bf52a%2Fe302c8ad-eec6-4f74-aa90-7405357fc263%2Fa6ckl3a_processed.jpeg&w=3840&q=75)
Transcribed Image Text:E (MV)
(b)
A fluoride ion selective electrode was used to analyse for fluoride
as part of the QC procedures during the production of Listerine
Fluoride Defense Anticavity Mouthwash. The mouthwash contains
0.02% sodium fluoride which is equivalent to 90 ppm of fluoride. The
QC specification for the mouthwash is 90 ± 5 ppm of fluoride. During
production three standards and six periodic samples were analysed
each hour. The mouthwash samples were diluted 100 fold before the
pH and ionic strength were adjusted using an appropriate TISAB
before analysis. The following data was obtained for the standards
and the calibration curve is shown below.
Table 1.
Solution
E (MV)
1.00 x 10 M F
5.00 x 10-5 M F
40.5
60.2
1.00 x 10-5 M F
100.0
Figure 5.
Continued...
120
-100
-80
-60
-40
-20
+o
-3.5 -3.7 -3.9 -4.1
-4.3 -4.5 -4.7 -4.9 -5.1 -5.3 -5.5
Log [fluoride]
(i)
Six samples were analysed and the following potentials,
measured in mV, were obtained; 58.9, 61.0, 60.7, 59.3, 59.6 and
61.7. Use this data to determine the fluoride concentration in the
mouthwash in ppm (RAM fluoride = 19.0).
(ii) Comment on whether the levels of fluoride found in the
mouthwash conform to the QC specifications.
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