Distillation And Purification Of Liquids Lab Report

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Experiment 2: Distillation and Purification of Liquids Angela Kaiser 100125701 ELL 308 September 19th, 2015 Introduction and Experimental: The purpose of this experiment was to determine the ratio of dichloromethane (DCM) to cyclohexane in a DCM/cyclohexane solution by carrying out a fractional distillation. The temperature and volume of distillate were measured periodically to determine the volume both components in the solution. The experiment was performed as written in “Experiment 2: Distillation and Purification of Liquids” from the Chemistry 2050 Lab Manual for Organic Chemistry Part 1, Fall 2015. Results and Observations: The solution of DCM and cyclohexane was clear and colourless. The following graph shows the recorded temperatures of the vapour at 1-2ml intervals during the distillation. Discussion All liquids exert vapour pressure, which can be described as the willingness of molecules in a solution to escape the liquid phase and become gaseous. The amount of vapour pressure exerted by a liquid is dependent on its intermolecular forces. Molecules held together by stronger intermolecular forces require more energy to escape the liquid phase and vapourize when compared to liquids with weaker intermolecular forces. The energy required for this phase change is provided in the form of heat, thus the vapour pressure of a liquid increases with temperature. A solution is said to boil when the vapour pressure of the most volatile liquid becomes

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