colligative properties lab

colligative properties lab - Kris Kelly Colligative...

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Kris Kelly Colligative Properties Lab CHEM 122L 2/11/08 Background/Thesis: This experiment deals with the Colligative properties of cyclohexane and cyclohexane mixed with an unknown solute. This added solute will lower the freezing point of the cyclohexane. The lowering of the freezing point is called freezing point depression. Through cooling both pure cyclohexane and cyclohexane and allowing them to warm gradually, a heating curve is then determined. Key Data: Volume of cyclohexane 10.00 mL Density of cyclohexane: .7726 g/mL Mass of cyclohexane: 7.726 g Mass of paper: .2376 g Mass of paper with unknown: .5746 g Mass of unknown: .3370 g Theoretical freezing point of cyclohexane: 6.6°C Freezing point depression constant for cyclohexane: 20.4 °C/m Results: See attached graphs Change in freezing point temperature from pure cyclohexane to cyclohexane solution:
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7.1°C Molality of Solution: 3.48 m Moles of unknown B: .0269 mol Molar Mass of unknown B: 12.53 g/mol Sample Calculations: Change in freezing point temp:
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colligative properties lab - Kris Kelly Colligative...

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