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experiment 15 - Experiment 15 Freezing Point A Colligative...

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Experiment 15: Freezing Point: A Colligative Property of Solutions Taylor MacDonald Partner: Genevieve Hinks 2/7/2008 Thursday Group #34 TA: Upul
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Introduction The experiment 15 was done to work together with my lab partner in order to collect and analyze data to determine the freezing points of a number of liquids, both pure solvent and solutions made from the solvent and several solutes. The data we collect was combined with the data of the entire lab group and we had a discussion about all the data we all collected and drew conclusions from it. We then collected data from a solution containing an unknown solid, determining the freezing point, and from that we were able to use our previous data to determine the molar mass of the unknown solid. We used the temperature probe and MeasureNet to collect our freezing point data. MeasureNet generated cooling curves that showed us graphically how the temperature varied with time as the liquid was cooled in a constant-temperature bath. We had to know how to correctly calibrate and use the temperature probe and MeasureNet, as well as accurately measure out the proper amounts of solutions and solids, and use a buret to measure out the correct amount of cyclohexane to make our unknown solution. This experiment connects to our lecture by demonstrating the freezing point, one of the colligative properties of solutions, which we have been talking about. It also connects to the phase change properties we’ve been talking about and the properties of solutions in particular.
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