OCHEM_Fractional_Distillation_6(제일 비슷)

OCHEM_Fractional_Distillation_6(제일 비슷)

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The Fractional Distillation of a Binary Mixture Lindy Hilpert Brad Hutnick Organic Chemistry 330 October 17, 2007
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Introduction: The purpose of this lab is to separate a binary mixture into its two components using fractional distillation and to then identify them by their boiling points. It is also to plot a graph of volume of distillate vs. temperature to determine the percent composition of each component in the mixture. Theory, Reactions, and Mechanisms: Fractional distillation is the separation of a mixture into its components by heating them until they reach their boiling points and evaporate. The liquids must have boiling points less than or equal to 25 degrees Celsius apart. The liquids are separated using a fractioning column. The fractioning column contains porous beads which increase the surface area. The increased surface area makes more space upon which more distillations can occur. The components start in the liquid phase, boil in a round bottom flask into the gas phase, then go through a condenser back into the liquid phase and are collected in a beaker. First, the liquid is boiled until it begins to evaporate. Then the vapors come in contact with the condenser, which has cool water running through it. The cold causes the vapor to condense and flow through a tube into a graduated cylinder. This process allows a very accurate temperature to be taken so that the boiling points can be determined and the components can be identified. Raoult’s Law and Dalton’s Law show the theory behind what makes the liquids boil. Raoult’s Law states that the vapor pressure of and ideal solution is equal to the sum of the vapor pressure times the mole fraction of each component present. Dalton’s Law states that the total pressure of a gaseous mixture is equal to the sum of the partial pressures of each component. Fractional distillation occurs through a series of equilibriums.
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This note was uploaded on 10/14/2009 for the course CH 310n taught by Professor Iverson during the Spring '08 term at University of Texas at Austin.

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OCHEM_Fractional_Distillation_6(제일 비슷)

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