A water sample was analyzed for Fe content using the iron-phenanthroline method. The following data were obtained from the analysis: Determine the value of the slope (m), y-intercept (b), and the coefficient of determination (r2)
A water sample was analyzed for Fe content using the iron-phenanthroline method. The following data were obtained from the analysis: Determine the value of the slope (m), y-intercept (b), and the coefficient of determination (r2)
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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A water sample was analyzed for Fe content using the iron-phenanthroline method. The following data were obtained from the analysis:
Determine the value of the slope (m), y-intercept (b), and the coefficient of determination (r2)
Transcribed Image Text:Reagent Blank Absorbance
Reagent Blank Absorbance
Concentration of Stock Solution: 10 ppm
Volume of Stock
Solution (mL)
Total Volume of
Standard Solution
(mL)
0.50
10.00
1.00
10.00
2.00
10.00
3.00
10.00
4.00
10.00
5.00
10.00
Volume of
Unknown Solution
Trial
(mL)
1
5.00
2
5.00
3
5.00
Absorbance (au)
0.003
Concentration of
Standard Solution
(ppm)
Total Volume of
Unknown Solution
(mL)
10.00
10.00
10.00
Absorbance (au)
0.012
0.132
0.267
0.349
0.428
0.560
Absorbance (au)
0.289
0.296
0.281
Transcribed Image Text:Determine the value of the slope (m), y-intercept (b), and the coefficient of determination (r²)
A m=0.1128; b = -3.0 x 10-³; r² = 0.9762
B) m = 0.1128; b = -4.0 x 105; r2 = 0.9880
m = 0.1128; b = -3.0 x 10-³; r² = 0.9880
D m = 0.1128; b = -4.0 x 10-5; r² = 0.9762
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