2CLabManual201303

Concentration 62 you may find it useful to use a

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Unformatted text preview: d at the wavelength of the Red absorption maximum. According to the modified form of Beer's Law introduced above, one can determine the numerical value of * ( = ℓ ) for some solute at a given wavelength by determining the slope of a plot of absorbance vs. concentration. 62 You may find it useful to use a spreadsheet program to do the following calculations. 1. Calculate the molar concentrations of the eight solutions you studied. 2. Calculate the 16 absorbances and use them along with the concentrations calculated in Step 1 to prepare four graphs of absorbance vs. concentration. Each of your plots should occupy most of an 8.5"x11" sheet of graph paper. From these plots determine the four pertinent values of *. (You must plot the data even if you have a hand calculator that will do linear regression for you. Many scientists have been blindsided by doing computer fits to data that really did not obey the fitting equation. If your plots are nicely linear then you can certainly get t...
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