Trying to figure out concentration of the soft drink with the lab's Beer Law plot? The transmittance is 51.3% and its absorbance is 0.290.

1 Answer
Dr. Hayek
Sep 27, 2015

Beer Lambert's Law: #C=A/(epsilonxxl)#

Explanation:

Beer Lambert's Law states: #A=epsilonxxlxxC#
where #epsilon# is the molar absorptivity of the compound, #l# is the length of the light path and #C# is the concentration of the solution.

From the calibration curve, you can get the slope which is: #slope=epsilonxxl#

Usually, the path length #l=1cm#. Then you can calculate #epsilon#.

Now that you have #A, epsilon and l# you can find the concentration #C=A/(epsilonxxl)#

I recommend this video on Beer-Lambert Lab:

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