Lab Report 5 - John Xu 3/29/07 Lab Report Experiment 5:...

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John Xu 3/29/07 Lab Report Experiment 5: Physical Properties of Pure Substances and Solutions Part A: Phase Behavior of Water, Carbon Dioxide, and t -Butanol 1. Running cold water over the flask with boiling water will cause the steam inside to condense, and therefore reduces the pressure of the gas above the liquid. The liquid cools slower than the gas, and will have a greater vapor pressure than the gas. Therefore, as seen on the phase diagram, water will start to boil as long as the pressure is low enough. 2. Increasing the temperature of the dry ice causes the solid to begin to sublimate, which explains the observation of the expansion of the pipet. Along with this, the pressure of the container also increases, which allows carbon dioxide to reach its critical point, and form water in addition to the solid and gas states. 3. Phase Diagram of t -Butanol Part B: Colligative Properties- Freezing Point Depression 4. Freezing point of t -butanol: 24.6 ° C ∆T f = 24.6 ° C – 13.0 ° C = 11.6 ° C (Trial 1)
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This note was uploaded on 04/07/2008 for the course CHEM 211 taught by Professor Crane, b during the Spring '06 term at Cornell University (Engineering School).

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Lab Report 5 - John Xu 3/29/07 Lab Report Experiment 5:...

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