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Lab 3 Lab Report

# Lab 3 Lab Report - Matthew Mueller Sept 5 2007 CHEM 207-01A...

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Matthew Mueller Sept. 5, 2007 CHEM 207-01A CONSTRUCTION OF CALIBRATION CURVES Objective This lab involved the measurement of transmittance of a solution at different concentrations and from that data the creation of a calibration curve comparing concentration to absorbance. Then the curve was used to identify the concentration of an unknown. Procedure Observations 1. Get the 5 standard solutions from the TA. 2. Determine the transmittance of each of the 5 standard solutions and the unknown 3 times and record to 3 sig-figs. The higher the concentration the less the transmittance and the more the absorbance. 3. Take the average of the %T for each concentration and convert to absorbance. (A = -log T) 4. Plot the absorbance’s and graph the line of best fit. Data and Results Solution Concentration Transmittance Absorbance 4.0 M %T = 20.6 % 0.686

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3.0 M %T = 24.8 % 0.606 2.0 M %T = 33.7 % 0.472 1.0 M %T = 53.1 % 0.275 5.0 M %T = 70.6 % 0.151 Unkown %T 1 = 24.3 % %T 2 = 23.7 % %T 3 = 23.9 % Avg. = 24.0 % 0.620
Graphically estimated concentration of unknown #5 = 3.11 M Conclusion
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Lab 3 Lab Report - Matthew Mueller Sept 5 2007 CHEM 207-01A...

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