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Unformatted text preview: Brian Hults Chemisty Post Lab 7 Conclusion/Discussion 18 October 2009 Our overall results show that based on the graphical analysis of the cooling curves, and the estimated freezing point of the Unknown Solution, as well as the calculations to obtain the molecular weight of the Unknown Substance, Glycine is most likely the Unknown Substance but due to possible human error, Alanine could also be an ending result since it was also close to the calculated average molecular weight. In part C, we used a pair of calculations to determine the effects of the van’t Hoff correction factor. We used the K f factor and a van’t Hoff factor of 1 to assume no dissociation to calculate the molality. This was based on a change in the freezing temperature of only 2 degrees Celsius, but in the resulting trial, the lowest obtained value was -5.5 degrees Celsius which is far past the predicted value of temperature change. We then repeated the same calculation with a van’t Hoff factor of three to account for the dissociated state...
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