Experiment 3 - Experiment 3: Colligative Properties...

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Unformatted text preview: Experiment 3: Colligative Properties Freezing Point Depression Lacey Frigaard Lab Partner: Sam Thompson February 12, 2008 Section: 13 Purpose: To explore one of the properties of a solution: freezing point depression. Also, to use this property to determine the molar mass of an unknown substance. I. DATA AND CALCULATIONS Table 1: Experimental Data p-dichlorobenzene unknown Table 2: Freezing Point Constant for p-dichlorobenzene Calculations Sample 1 Sample 2 Freezing Point Depression T f = T f -- T f = 9.1 C(-2.1 C) = 9.2 C(-2.2 C) 11.2 C 11.4 C Moles of solute, p- dichlorobenzene = 0.3 g (1 mol/ 147.0 g) 2.04 x 10-3 mol 2.04 x 10-3 mol Molality of solution= Moles of solute Kg of solvent (3.9 g = 3.9 x 10-3 kg solvent) = 2.04 x 10-3 mol 3.9 x 10-3 kg 0.52 m 0.52 m Molal Freezing Point T f = K f m K f = T f /m = 11.2 C/ 0.52 m = 11.4 C/ 0.52 m 21.5 C/m 21.9 C/m Percent error Theoretical-Actual *100 Actual = (21.5-20.2)/20.2 *100 = (21.9-20.2)/20.2 *100= (21....
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This lab report was uploaded on 04/09/2008 for the course CHEM 1152 taught by Professor Splan during the Spring '08 term at University of Minnesota Duluth.

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Experiment 3 - Experiment 3: Colligative Properties...

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