Posted: September 14th, 2017

ABSORPTION SPECTROSCOPY

ABSORPTION SPECTROSCOPY
Absorption Spectroscopy

Question 1
Describe the sample you intend to use.
A discussion of suitable samples can be found
in the
experiment guide
.
Indicate which food dye you will be evalu
a
ting. Sample
selection is discussed in the procedure section of the experiment guide.
Question 2
Make a list of the oper
ations you will need to perform in order to display a spectrum of
your food dye on the spectrophotometer. For this discussion assume you will be using
the visible light source pictured in figure 8
–
20 of the technique book.
Question 3
Create a procedure
you can use to prepare a series of solutions to determine the molar
absorptivity of your food dye. The problem is outlined in the experiment guide
(Preparing Standards). The material on solution preparation in chapter 11 of the lab
book may be useful.
Que
stion 4
The sample you put into the spectrometer must be clear (transparent) and not too dark.
It must not be cloudy and must not have things floating in it.
Explain why this is true.
Copy your answer
s
into your lab notebook s
o you have them
to use in lab
.

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