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Chemistry 41
Spring 2005
Fundamentals of Spectrophotometry Problem Set # 1
1.
Define the following terms:
frequency, wavenumber, monochromatic light, molar
absorptivity and Beer’s law.
2.
When does Beer’s law fail and why?
3.
Why do we say that light has a dual nature?
4.
List the regions of the electromagnetic spectrum in order of decreasing energy.
5.
Calculate the absorbance of solutions which have the following percent transmittance
(% T) values:
(a)
75,
(b)
52,
(c)
10,
(d)
4.1 and (e) 1.0.
6.
Convert the following absorbance readings to percent transmittance (% T):
(a) 0.005,
(b)
0.23,
(c)
0.48
(d)
1.00 and (e)
2.0.
7.
A solution was found to have a 15.6 % transmittance at its wavelength of maximum
absorption using a cell with a path length of 5.00 cm.
Calculate the % T and
absorbance of the solution in (a) a 10.00 cm and (b) a 1.0 cm cell.
8.
A compound has a molar absorptivity of 9,300 M
1
cm
1
at λ = 395 nm.
Calculate the
molarity of a solution of this compound which has an absorbance of 0.425 when
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