Using the data and formula shown,Determine the concentration of iron in the sample and its standard deviation from the least-squares equation of the line.Compare the unknown concentration to that obtained manually from a calibration curve. CMnO41.00 ppm2.50 ppm5.00 ppm7.50 ppm10.00 ppm15.00 ppm20.00 ppm25.00 ppmunknownAbsorbance at 580 nm0.0300.0720.1470.2170.3010.4420.5770.7380.356 The standard deviation about regression,-N-2The standard deviation of the slope.EThe standard deviation of the intercept,| Nax - (Σκ)NSSesid=[-(b + mx)]²·Ž[x-m-Sax1N - (Σx)/Σx

Answered: 50 ppm .00 ppm 50 ppm 100

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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Using the data and formula shown,

Determine the concentration of iron in the sample and its standard deviation from the least-squares equation of the line.
Compare the unknown concentration to that obtained manually from a calibration curve.

CMnO4
1.00 ppm
2.50 ppm
5.00 ppm
7.50 ppm
10.00 ppm
15.00 ppm
20.00 ppm
25.00 ppm
unknown
Absorbance at 580 nm
0.030
0.072
0.147
0.217
0.301
0.442
0.577
0.738
0.356

The standard deviation about regression,
-
N-2
The standard deviation of the slope.
E
The standard deviation of the intercept,
| Nax - (Σκ)
N
SSesid=[-(b + mx)]²
·Ž[x-
m-Sax
1
N - (Σx)/Σx

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