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Beer's Law Molar Absorptivity Calculation

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A solution with a concentration of 0.1 M0.1\ M has an absorbance of 0.50.5 when measured in a cuvette with a 1 cm1\ cm path length. According to Beer’s law, which of the following conclusions is best supported by this information?

A

By rearranging Beer’s Law A=a∗b∗cA = a*b*c, the molar absorptivity is calculated as a=Ab∗c=0.51∗0.1=5 L/(mol⋅cm)a = \frac{A}{b*c} = \frac{0.5}{1*0.1} = 5\ L/(mol\cdot cm).

B

The measured absorbance supports a conclusion that the concentration must be increased to achieve a molar absorptivity of at least 10 L/(mol·cm).

C

An absorbance of 0.5 under these conditions suggests that the path length is insufficient to capture the true concentration of the solution.

D

The absorbance value indicates that the solution has an unusually low molar absorptivity, implying weak light absorption.

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