I have converted the NaCl (ppm) into NaCL (M) but am uncertain what the unquenched concentration fraction is and how to calculate it. Please see the attached image for the full question.
I have converted the NaCl (ppm) into NaCL (M) but am uncertain what the unquenched concentration fraction is and how to calculate it. Please see the attached image for the full question.
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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I have converted the NaCl (ppm) into NaCL (M) but am uncertain what the unquenched concentration fraction is and how to calculate it. Please see the attached image for the full question.
![The only substance that will normally interfere in the analysis of quinine in tonic
water is the chloride ion. The presence of this electrolyte in the solution can cause
quenching of the fluorescence process. This interference is negligible if the
chloride ion concentration is below 0.4 millimoles/L.
The quenching of the fluorescence by chloride ions was investigated by measuring
the fluorescence of a solution of known quinine concentration as a function of Cl-
ion concentration. Using the data from the table below prepare a plot of the NaCl
concentration (in moles/L) versus the unquenched concentration fraction ([ ]o/[ ]).
Plot NaCl concentration (M) on the x-axis and [ ]o/[ ] on the y-axis. Find the best
equation in Excel that will fit the data.
Fluorescence
NaCl Conc.
(ppm)
reading [ ]
@450nm
444.9
50
407.7
100
375.1
300
266.7
1000
130.1
2000
80.9](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3ec04b9c-a06b-4ae7-ae01-c4364b0b2fda%2F490a987c-3a7a-4be7-bc20-88c1fbcd25ee%2Fgu847q_processed.png&w=3840&q=75)
Transcribed Image Text:The only substance that will normally interfere in the analysis of quinine in tonic
water is the chloride ion. The presence of this electrolyte in the solution can cause
quenching of the fluorescence process. This interference is negligible if the
chloride ion concentration is below 0.4 millimoles/L.
The quenching of the fluorescence by chloride ions was investigated by measuring
the fluorescence of a solution of known quinine concentration as a function of Cl-
ion concentration. Using the data from the table below prepare a plot of the NaCl
concentration (in moles/L) versus the unquenched concentration fraction ([ ]o/[ ]).
Plot NaCl concentration (M) on the x-axis and [ ]o/[ ] on the y-axis. Find the best
equation in Excel that will fit the data.
Fluorescence
NaCl Conc.
(ppm)
reading [ ]
@450nm
444.9
50
407.7
100
375.1
300
266.7
1000
130.1
2000
80.9
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