Question

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.

Answer 1

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: