Which of the following are correct for Beers Law?
I Absorbance increases as concentration increases.
II Absorbance decreases as pathlength increases.
III The molar absorptivity value is chromophore and wavelength specific.
IV The absorption spectrum is a graph showing absorbance changes with wavelength.
A)I,II,and III
B)1,III,and IV
C)II,III,and IV
D)I and III
E)I,II,III,and IV

Question

Quizplus · Accepted Answer

I and IV are correct because Beer's Law states that absorbance is directly proportional to the concentration of the absorbing species and the path length through which the light passes. III is correct because the molar absorptivity (or extinction coefficient) is a measure of how strongly a chemical species absorbs light at a given wavelength, which is specific to each chromophore. II is incorrect because according to Beer's Law, absorbance increases with path length, not decreases.

Which of the Following Are Correct for Beers Law