Beer's Law Plot - Chemistry help?
A student determined the percent transmittance of two solutions of unknown concentration to be 96% and 3% respectively.
(a) Explain why the student should or should not be confident in reading the concentration of the second unknown directly from Beer's law plot.
- I was thinking it has something to do with the linear relationship between absorbency and concentration. But, knowing that, I could not come up with a solid reason.
(b) Suggest something the student could do with the second sample that would make the determination of the concentration of colored dye more accurate.
-Ya i have no idea.
More Questions From This User See All
Answers & Comments
Verified answer
According to this site
http://www.humboldt.edu/~dp6/chem110/color/color.h...
transmittance values start to deviate from linearity below 28% (and above 90%). So at 3% you are not in a region of the curve where you can be confidant that beers law is being obeyed.
(b) Prepare a known dilution, or a series of dilutions, of the sample. Analyse the transmittance at the lower concentrations. Ideally you want to get a transmittance somewhere in the middle of the curve. Once you have the concentration of a diluted sample, work out what the original was.