If the standard addition intercept is the major source of uncertainty, find the uncertainty in the concentration of Sr in tooth enamel in parts per million. uncertainty: 102.07 Incorrect Find the 95% confidence interval for Sr in tooth enamel. Student's / values can be found in the table. 95% confidence interval: ppm 324.78 ppm
If the standard addition intercept is the major source of uncertainty, find the uncertainty in the concentration of Sr in tooth enamel in parts per million. uncertainty: 102.07 Incorrect Find the 95% confidence interval for Sr in tooth enamel. Student's / values can be found in the table. 95% confidence interval: ppm 324.78 ppm
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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If the standard addition intercept is the major source of uncertainty, find the uncertainty in the concentration of Sr in tooth enamel in parts per million. Find the 95% confidence interval for Sr in tooth enamel.
Transcribed Image Text:Find the concentration of Sr and its uncertainty in the 10.0-mL sample solution in parts per billion = ng/mL.
concentration: 8.72
concentration: 117.05
Find the concentration of Sr in tooth enamel in parts per million = µg/g.
uncertainty:
102.07
Incorrect
ppb
If the standard addition intercept is the major source of uncertainty, find the uncertainty in the concentration of Sr in tooth
enamel in parts per million.
95% confidence interval:
ppm
324.78
uncertainty:
ppm
Find the 95% confidence interval for Sr in tooth enamel. Student's + values can be found in the table.
0.43
ppm
Ppb
![Standard addition graph. Tooth enamel consists mainly of the mineral calcium hydroxyapatite, Ca₁0(PO4)6(OH)2. Trace
elements in teeth of archeological specimens provide anthropologist with clues about diet and diseases of ancient people.
Students at Hamline University used atomic absorption spectroscopy to measure strontium in enamel from extracted wisdom
teeth. Solutions were prepared as in Figure 5-8 with a constant total volume of 10.0 mL containing 0.732 mg of dissolved tooth
enamel plus variable concentrations of added Sr.
Added Sr (ng/mL = ppb)| Signal (arbitrary units)
0
28.0
2.50
34.3
5.00
42.8
7.50
51.5
10.00
58.6
Place 5 mL of unknown
in each flask.
Add 0, 5, 10, 15, and 20 mL
of standard to the five flasks.
Add analytical reagents to
each flask, dilute to the
50-ml mark, and mix.
2
3
4
5
t
1x45
x-Intercept
-[X]+
Harris/Lucy, Quantitative Chemical Analysis, 10e, Ⓒ 2020 W. H. Freeman and Company
[S] -](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9156f8b7-4f51-47ca-9489-d1b49d440928%2Fd8a72f24-0939-4517-9109-1cfbeabffc2d%2Fdvltupj_processed.png&w=3840&q=75)
Transcribed Image Text:Standard addition graph. Tooth enamel consists mainly of the mineral calcium hydroxyapatite, Ca₁0(PO4)6(OH)2. Trace
elements in teeth of archeological specimens provide anthropologist with clues about diet and diseases of ancient people.
Students at Hamline University used atomic absorption spectroscopy to measure strontium in enamel from extracted wisdom
teeth. Solutions were prepared as in Figure 5-8 with a constant total volume of 10.0 mL containing 0.732 mg of dissolved tooth
enamel plus variable concentrations of added Sr.
Added Sr (ng/mL = ppb)| Signal (arbitrary units)
0
28.0
2.50
34.3
5.00
42.8
7.50
51.5
10.00
58.6
Place 5 mL of unknown
in each flask.
Add 0, 5, 10, 15, and 20 mL
of standard to the five flasks.
Add analytical reagents to
each flask, dilute to the
50-ml mark, and mix.
2
3
4
5
t
1x45
x-Intercept
-[X]+
Harris/Lucy, Quantitative Chemical Analysis, 10e, Ⓒ 2020 W. H. Freeman and Company
[S] -
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