Lab 17 - Experiment 17: Colligative Properties and Freezing...

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Experiment 17: Colligative Properties and Freezing Point Depression The purpose of this experiment was to determine the freezing point of pure Benzophenone as well the freezing point depression that occurs when Cyclohexanone is added. Freezing point depression is a colligative property and thus depends on the number of solute particles in solution (molality) and not on the nature of the solute. In this experiment the freezing point depression constant, Kf, for benzophenone was determined. In part 1, 10.140g of Benzophenone was melted and frozen and the temp. vs. time data was plotted in Excel in order to obtain the freezing point curve for pure Benzophenone. The plot shows a dip at around 120s that indicates supercooling, the process of lowering the temperature of a liquid below its freezing point without it becoming a solid. By extrapolating the line in the curve after the supercooling, the freezing point was determined to be 46.4 ° C. The accepted freezing point for Benzophenone is 47.8
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Lab 17 - Experiment 17: Colligative Properties and Freezing...

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