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Unformatted text preview: Experiment 6 Photometric determination of an Equilibrium Constant Performed 02-09-10 Joseph Volpe Submitted 02-17-10 Partner Jared Williams Chemistry 1051L 2 Sneah Dugar Purpose The purpose of this experiment was to mix various amounts of acidified ferric nitrate, and Potassium thiocyanate of different concentrations and test the absorbance in the spectrometer. This experiment was the first time a mohr pipette was used, as it was necessary in order to be very accurate. By measuring the absorbance of each solution and knowing the concentrations the Beer-Lambert law can be performed in order to determine the molar absorbtivity, and c the concentration of the compound in solution. After finding these values more calculations can be performed to determine molar values in the equilibrium reaction. Experimental Procedure Dillion, Stephanie Photometric determination of an Equilibrium Constant Chemistry 1051L Online Manual 02-12-11 02-07-11 http://www.chem.fsu.edu/chemlab/chm1051lmanual/eqconstant/pr ocedure.html Changes: No changes from the manual were made in lab. Data & Results Solution Volume Fe 3+ mL Volume KSCN mL Total Volume mL [Fe 3+ ] (M) [KSCN] (M) Absor A 5 1 10 .01 1.0e^-4 0.5 B 5 2 10 .01 2.0e^-4 1.6 C 5 3 10 .01 3.0e^-4 2.4 D 5 4 10 .01 4.0e^-4 2.8 E 5 5 10 .01 5.0e^-4 2.9 Sol...
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