Worksheet: The Beer–Lambert Law

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?

  • A 𝑇 = 1 𝐴 l o g
  • B 𝐴 = 1 𝑇 l o g
  • C 𝑇 = ( 𝐴 ) l o g
  • D 𝐴 = ( 𝑇 ) l o g

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 𝜆 —wavelength
  • B 𝐴 —absorbance
  • C 𝜀 —molar absorptivity coefficient
  • D 𝑏 —path length of the sample
  • E 𝑐 —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.

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