Worksheet: The Beer–Lambert Law

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In this worksheet, we will practice using the Beer–Lambert Law to calculate absorption from the molar extinction coefficient, path length, and concentration.

Q1:

According to the Beer–Lambert law, which two variables are linearly correlated if the path length of the cell is held constant?

AConcentration and wavelength
BTransmission intensity and concentration
CTransmission intensity and wavelength
DAbsorbance and concentration

Q2:

Which of the following describes the correct relationship between absorbance and transmission?

Q3:

An absorbance value of zero corresponds to 100% transmittance. What transmittance value corresponds to an absorbance value of 2?

A0%
B98%
C1%
D80%

Q4:

Which variable in Beer’s law represents how well a chemical species absorbs light at a given wavelength?

A—wavelength
B—absorbance
C—molar absorptivity coefficient
D—path length of the sample
E—concentration

Q5:

According to the Beer–Lambert Law, what happens to the absorbance reading if the concentration of a solution is halved?

AThe absorbance is quartered.
BThe absorbance is halved.
CMore information is needed.
DThe absorbance is quadrupled.
EThe absorbance is doubled.