chem 211 lab report 5 - the temperature of the water...

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Properties of Liquids, Solids, and Solutions Purpose: The purpose of this laboratory investigation was for the author to study physical properties of different forms of matter. The author could observe freezing points, boiling points, freezing point of depression, and heat of vaporization. Procedure: The team observed properties of boiling H20 and subliming CO2. Next, the author determined the triple point of t-butanol and then the boiling and freezing point of t-butanol. Next, the class observed the boiling of liquid nitrogen in hot H2O. Finally, the author observed the freezing of a solution of t-butanol and unknown #9. The author determined the approximate molecular weight of unknown #9 and approximations of the heat of vaporization of liquid nitrogen. Data and Analysis: Part A When the flask containing boiling water was held under a stream of cold water,
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Unformatted text preview: the temperature of the water decreased drastically while the pressure was held the same. The temperature decreased in a similar manner when the author placed his hands over the flask containing boiling water and ice on the flask containing boiling water. Thus, the H2O was transitioning from gas back to liquid as it cooled. When the solid carbon dioxide was placed in the pipet bulb under constant pressure, it began to sublime. This is because carbon dioxide is only solid at extremely low temperatures, so when it was introduced to room temperature it quickly sublimed. As time progressed, carbon dioxide gas built up in the pipet, raising the pressure, which eventually caused the pipet to burst. Analysis continued on following pages....
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