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CHEM151 Phoenix Beers Law Curve and Unknowns Lab Report

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Beer’s Law Hands-On Labs, Inc. Version 42-0140-00-03 Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor. Exercise 2: Beer’s Law Curve and Unknowns Data Table 1. Concentration and Resistance. Tube Label B 1 2 3 4 5 6 7 8 9 W CD 1 CD 2 Concentration of Blue Dye in Test Tube (M) 2.57 x 10-4 M -4 2.31 x 10 M 2.06 x 10-4 M 1.82 x 10-4 M 1.54 x 10-4 M 1.29 x 10-4 M 1.03 x 10-4 M 7.0 x 10-5 M 5.14 x 10-5 M 2.6 x 10-5 M 0M 7.0 x 10-5 M 5.14 x 10-5 M Graph 1. Plot of Concentration vs. Resistance. Plot Resistance Reading on Colorimeter (Ω) 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.6 1.5 CONCENTRATION PLOT AGAINST RESISTANCE 2.5 Reistance 2 1.5 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 1 0.5 0 0 0.00005 0.0001 0.00015 0.0002 0.00025 0.0003 Concentration Questions A. Describe possible sources of error in this experiment. a. Human Error: i. Misjudging calculations, especially in the graduated cylinder, is very easy because we are trying to gauge a 0.5 measurement by eye which can be very difficult. b. Mathematical Error: i. Using poor significant figures, we could cause a problem in our experimen ...
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