A standard solution was put through appropriate dilu tions to give the concentrationsof iron shown in the ac companying table. The iron(II)-1,10,phenanthroline complexwas then formed in 25.0-ml aliquots of these solutions, following which each wasdiluted to 50.0 mL (see color plate 15). The absorbances in the table (1.00-cm cells)were recorded at 510 nmFe(II) Concentration inOriginal Solution, ppmAşie4.000.1600.39010.016.00.63024.00.95032.01.26040.01.580(a) Plot a calibration curve from these data.(b) Use the method of least squares to find an equa tion relatin g absorbance and theconcentration of iron(II).(c) Calculate the standard deviation of the slope and intercept.

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A standard solution was put through appropriate dilu tions to give the concentrations of iron shown in the ac companying table. The iron(II)-1,10,phenanthroline complex was then formed in 25.0-mL aliquots of these solutions, following which each was dluted to 50.0 mL (see color plate 15). The absorbances in the table (1.00-cm cells) vere recorded at 510 nm Fe(II) Concentration in Original Solution, Ppm 4.00 0.160 10.0 16.0 24.0 0.390 0.630 0.950 32.0 1.260 40.0 1.580 a) Plot a calibration curve from these data. b) Use the method of least squares to find an equa tion relating absorbance and the concentration of iron(II). c) Calculate the standard deviati on of the slope and intercept.

A standard solution was put through appropriate dilu tions to give the concentrations of iron shown in the ac companying table. The iron(II)-1,10,phenanthroline complex was then formed in 25.0-mL aliquots of these solutions, following which each was dluted to 50.0 mL (see color plate 15). The absorbances in the table (1.00-cm cells) vere recorded at 510 nm Fe(II) Concentration in Original Solution, Ppm 4.00 0.160 10.0 16.0 24.0 0.390 0.630 0.950 32.0 1.260 40.0 1.580 a) Plot a calibration curve from these data. b) Use the method of least squares to find an equa tion relating absorbance and the concentration of iron(II). c) Calculate the standard deviati on of the slope and intercept.

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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Question

A standard solution was put through appropriate dilu tions to give the concentrations
of iron shown in the ac companying table. The iron(II)-1,10,phenanthroline complex
was then formed in 25.0-ml aliquots of these solutions, following which each was
diluted to 50.0 mL (see color plate 15). The absorbances in the table (1.00-cm cells)
were recorded at 510 nm
Fe(II) Concentration in
Original Solution, ppm
Aşie
4.00
0.160
0.390
10.0
16.0
0.630
24.0
0.950
32.0
1.260
40.0
1.580
(a) Plot a calibration curve from these data.
(b) Use the method of least squares to find an equa tion relatin g absorbance and the
concentration of iron(II).
(c) Calculate the standard deviation of the slope and intercept.

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