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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)

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)

Principles of Modern Chemistry
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter11: Solutions
Section: Chapter Questions
Problem 10P
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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)

 

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: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
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
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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