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Beers Law Lab Report

Beers Law Lab Report - The Determination of Molar...

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The Determination of Molar Absorptivity Using Beer’s Law Author: Michelle Abercrombie Lab Partners: Morgan Seidl, Crystal Murphy, Will Marcello Instructor: Ivan Ogloblin Chemistry 104B, section 19 Date work performed: 22 August 2007 Date work submitted: 29 August 2007 Abstract The molar absorbtivity of Erythrosin B (Red Dye #3) was determined by making a series of four solutions diluted from the stock solution using the series dilution method. The absorbencies of those solutions were then measured and plotted. Beer’s Law was proved through the linearity of this plot and ε was determined from the slope of this line.
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Introduction The objective of this experiment is to determine the molar absorptivity of Erythrosin B (Red Dye #3) by drawing a Beer’s Law plot and analyzing its linearity. The plot should have a linear line if the absorptivity is between 0.01 and 1. If the molar absorptivity of the sample is over 1, then Beer’s Law will not apply. Given a stock solution of Erythrosin B of concentration 9.777E-4, dilute to make four different test solutions of various concentrations that will measure
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