You obtain the following calibration curve.Concentration versus Absorption of Iron1.4y = 211.86xR = 0.97531.210.80.60.40.20.0010.0020.0030.0040.0050.0060.007Concentration (M)Using the equation from the calibration curve, determinethe concentration of iron in your substance when yoursubstance has an absorbance of 0.694. Report your answerto four decimal places. Do not use scientific notation(Canvas will not accept letters in a numerical answer) anddo not include units in the answer.Absorption

Calibration curve is a general method to determine the concentration of unknown sample. It is…

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You obtain the following calibration curve. Concentration versus Absorption of Iron 1.4 y = 211.86x R- 0.9753 1.2

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

Chapter20: Molecular Spectroscopy And Photochemistry

Section: Chapter Questions

Problem 6P

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Concept explainers

Spectroanalytical Methods

Spectroanalytical methods measure the wavelength and intensity of radiations that are either emitted or absorbed by a molecular or atomic species. These methods are useful for evaluating the electronic or atomic arrangement of the molecules of a given analyte.

Question

You obtain the following calibration curve.
Concentration versus Absorption of Iron
1.4
y = 211.86x
R = 0.9753
1.2
1
0.8
0.6
0.4
0.2
0.001
0.002
0.003
0.004
0.005
0.006
0.007
Concentration (M)
Using the equation from the calibration curve, determine
the concentration of iron in your substance when your
substance has an absorbance of 0.694. Report your answer
to four decimal places. Do not use scientific notation
(Canvas will not accept letters in a numerical answer) and
do not include units in the answer.
Absorption

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A certain mixture of gasoline obtained from a petroleum refinery plant was found to contain only isooctane (C8H18; FM=114.22), methyl tert-butyl ether (C5H12O); FM=88.15), and tetraethyl lead (C8H20Pb; FM=323.4), a gasoline preservative. Upon complete combustion of 0.4582 g sample, it was found out that the mass of the CO2 (FM = 44.01) absorbent increases by 1.0702 g, while the mass of residue PbO (FM = 223.2) was determined to be 0.0964 g. From this data, calculate the following: a. % (w/w) C8H18b. % (w/w) C5H12Oc. % (w/w) C8H20Pb