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
This is the end of the preview. Sign up
to
access the rest of the document.
This note was uploaded on 11/03/2009 for the course CHEM 241 taught by Professor Tiani during the Summer '08 term at UNC.
 Summer '08
 tiani
 pH

Click to edit the document details