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LabReport15 - Introduction The purpose of Experiment 15 was...

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Introduction The purpose of Experiment 15 was to determine the freezing point of certain solutions made from a pure solvent and several solutes. In this experiment, cyclohexane was the pure solvent, while naphthalene and biphenyl were solutes dissolved in the cyclohexane for the experimental solutions. The freezing points of these solutions were to be determined by using the MeasureNet system to produce a cooling curve. This displays the decrease of the solution in temperature (in degrees Celsius) over time (in seconds). A “dip” in the curve occurs as the solution or pure solvent freezes, and the temperature will remain constant. The technique that was practiced involved setting up an apparatus of test tubes in Styrofoam cups filled with ice, to be used as a water bath. It was important that the solution be stirred thoroughly as measurements were taken, so that temperature homogeneity was maintained. The cooling curve experiments were plotted and printed. The class’s combined results were later compiled in a single plot of freezing point vs. concentration, which was to be discussed and analyzed. The second part of this experiment involved an unknown solute, whose molar mass was to be determined by recording the initial mass and using the density of cyclohexane to determine its mass in the solution. The freezing point of the solution would then be determined using the MeasureNet system to produce a cooling curve. The concentration of the solution would
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