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Experiment 17 - Experiment 17 Colligative Properties...

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Experiment # 17: Colligative Properties: Freezing Point Depression
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Introduction: The purpose of this experiment was to observe the freezing point of pure benzophenone and to empirically derive the relationship between freezing point depression and solute concentration. This was done by creating heated, super saturated solutions and then recording temperature as the solution cooled (noting the time and temperature at which crystal formation was observed). Pre-Lab Questions: See attached notebook sheet (p. 12) Data: See attached sheet (p. 7) Calculations: The freezing points for the pure benzophenone were extrapolated from the plot, the percent error compared to the actual value was calculated as follows: = . ° , = . ° Tfexperiment 46 1 C Tfactual 47 8 C % = - error | Tfexperiment Tfactual| Tfactual∙100 = . ° - . ° . ° = . % |46 1 C 47 8 C |47 8 C ∙100 3 56 The freezing points of the benzophenone and cyclohexane solution in part 2 were extrapolated from the plots. The values are shown below with the freezing point depression calculated for each: = = . ° , = . ° , = . ° Tf' Tfexperiment 46 1 C Tf1 41 3 C Tf2 34 9 C
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= - = . ° - . ° = . ° ∆Tf1 |Tf' Tf1| |46 1 C 41 3 C 4 8 C = - = . ° - . ° = . ° ∆Tf2 |Tf' Tf2| |46 1 C 34 9 C| 11 2 C In order to determine the freezing point depression constants for each of the
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