SC CHEM 333 - Simple Distillation of Organic Molecules Pre-Lab (6 pages)

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Simple Distillation of Organic Molecules Pre-Lab



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Organic Chemistry 333L section 001 Laboratory Pre Lab Simple Distillation of Organic Molecules By Cameron Kahn 14 January 2019 TA James Collie Simple Distillation of Organic Molecules Object In this experiment he she will learn how to set up a simple distillation apparatus He she will use an unknown organic compound to do the distillation process Two methods of distillation will be used the use of a condensing column and the use of a fractionating column The recorded temperatures and volumes will be plotted against each other on graphic paper or excel This will show the boiling point of the unknown molecule Based upon the resulted boiling point the unknown ketone will be identified The purpose of the experiment is to show a simple purification process and two methods of separating liquids and then identifying the compound in question using the recorded boiling point Theory In the liquid phase ionic attraction hydrogen bonding dipole interactions and van der Waals forces hold the molecules together When these attractions are overcome the liquid will vaporize which in turn will become a gas To overcome these attractions the temperature at which the vapor pressure of the liquid equals the pressure exerted upon the surface of that liquid is the boiling point of that liquid Atmospheric pressure suppresses the liquid so energy in the form of heat is required to increase the kinetic energy and therefore overcomes this pressure thus causing the liquid to boil CITATION Geo12 l 1033 Liquids can have impurities which causes the boiling point to have a greater range This effect is due to how the impurities interact with the compound that is being measured Finding the boiling point of a liquid is harder than finding the melting point of a compound In addition if a liquid has a constant boiling point it has a higher probability of being pure This is not always true Two or more miscible liquids mixed together will have the exact same boiling points Other factors that can cause the



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