Post-Lab #5 - Jacob Sutker Peter Widger Lab#5 Properties of...

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Jacob Sutker Peter Widger October 23, 2006 Lab #5: Properties of Liquids, Solids, and Solutions Part A: Freezing Point of t-butanol 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 0 50 100 150 200 250 Time(s) Temperature(°C) Freezing Point of t-butanol 1: After referring to the phase diagram for water, the observations in part 1 are easily explained. When the stopper was inserted into the flask with the water brought to a boil, the pressure was able to be kept constant. Therefore, when we ran water over the bottom of the inverted flask, the cold water cooled down the air inside, reducing its pressure in accordance with Gay-Lussac’s law. Therefore, this pressure drop caused the water to drop from the liquid state on the phase diagram to the gas state, resulting in the water boiling again. Additionally, when I placed my cool hand and crushed ice on the bottom of the inverted flask in a similar fashion, similar bubbling occurred as expected. On the other hand, when I gripped the neck of the inverted, cooled flask, the water began to boil yet again.
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