lab 20 - Dominique Liuzzi Gloria Mo 28 April 2008 Lab 20:...

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Dominique Liuzzi Gloria Mo 28 April 2008 Lab 20: Colligative Properties: Freezing Point Depression The purpose of this experiment was to determine the freezing point of pure benzophenone and then the freezing point of a benzophenone and cyclohexanone solution. From there, we can calculate the freezing point depression and finally, the freezing point depression constant. In the first part of the experiment we found the freezing point of pure 10.01g benzophenone and recorded the temperature as it cooled. After making a graph of temperature versus time we found the freezing temperature to be 47.6°C (where the crystals began to form), the actual value being 47.8°C. We had only a 0.418% error. In the second part of the experiment we found the freezing points of two benzophenone and cyclohexanone solutions. The first solution had 1.0mL of cyclohexanone added to the 10.01g of benzophenone. In the second solution, we added 5.01g of benzophenone to the previous solution with 1.0 mL of cyclohexanone. We found the freezing point of this first solution to be
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lab 20 - Dominique Liuzzi Gloria Mo 28 April 2008 Lab 20:...

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