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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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 Spring '06
 Van Koppen
 pH

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