Answered: A series of caffeine standards were…

A series of caffeine standards were prepared and scanned with an IR spectrophotometer yielding the following profile. Describe the spectra obtained in relation to the concentration levels.

Introductory Chemistry: An Active Learning Approach

6th Edition

ISBN:9781305079250

Author:Mark S. Cracolice, Ed Peters

Publisher:Mark S. Cracolice, Ed Peters

Chapter3: Measurement And Chemical Calculations

Section: Chapter Questions

Problem 5E

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Concept explainers

Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.

Question

A series of caffeine standards were prepared and scanned with an IR spectrophotometer yielding the following profile. Describe the spectra obtained in relation to the concentration levels.

0.07
O mp/l
1000 mg
0.06
2000 mg/
3000 mg/
4000 mg
0.05
0.04
0.03
0.02
0.01
1747
1728
1709
1689
1670
1651
1632
1612
Wavenumber / (cm)
Abs

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