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

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Chemistry

50 ppm .00 ppm 50 ppm 100

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter30: Kinetic Methods Of Analysis

Section: Chapter Questions

Problem 30.2QAP

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Introduction to chemistry

Chemistry is a branch of science that deals with the analysis of material and the substances that comprise it. It also manages the properties of these substances and their reactions to form new substances. It is basically centered on particles and atoms that make up components and mixtures. These chemical species will in general connect using bonds.

Question

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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