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Distillation Of Mixtures Formal Report

1880 words - 8 pages

IntroductionThe purpose of this experiment is split up into three parts: separating cyclohexane and toluene through distillation, performing gas chromatography on the substances that were distilled, and separating a salt-water mixture through distillation. Distillation involves the ideas of vaporization and condensation. Through these procedures, liquid mixtures can be purified. An important step in the process is finding a boiling point. When liquids are heated, there is an energy added to the system. Once enough energy has been added, a molecule can change its conformation (liquid to a gas). Once a molecule changes from the liquid phase to the vapor phase, the vapor exerts a pressure called equilibrium vapor pressure. The more molecules that convert to gases, and how temperature is controlled, will cause this pressure to increase. Boiling begins when the equilibrium vapor pressure equals the pressure given off by the atmosphere, this is the boiling point.In order to understand boiling points, the ideal gas law (PV = nRT) can be used. Boiling points are measured after temperature and pressure have been figured out. Pressure in a system can adversely affect boiling point, therefore all calculations will be taken at Standard Temperature and Pressure (STP), 760 mm Hg. One warning to note is never heat a closed system because glassware could break. Instead of heating, a vacuum will be used to lower the pressure and in turn lower the boiling point. This procedure helps when samples are unstable at high temperatures.There are four main types of distillation. One is simple distillation, the separation of liquids that boil below 150 °C at 1 atm from non-volatile impurities and other soluble liquids that have a boiling point at least 25 °C higher than the first. When performing a simple distillation, everything must be done correctly. All glassware needs to be tightly connected and everything must clamped snugly to avoid accidents and mistakes. All joints need to be closed securely. The thermometer must be added to the distilling flask to measure boiling point.Another type of distillation is vacuum distillation, the separation of liquids that boil over 150 °C at 1 atm from non-volatile impurities or other soluble liquids that have a boiling point at least 25 °C higher than the first. A third type of distillation is Fractional Distillation, it uses a fractioning column to have numerous vaporizations and condensations, separates liquids that are soluble in one another and have less than 25 °C difference in boiling points. Some advantages to Fractional Distillation are that multiple distillations can be completed and collected in the same vessel. By using a fractional column, there are many sites to allow vapor to continually condense and vaporize. Anything that re-vaporized would have a lower boiling point. The final type of distillation is steam distillation which separates insoluble mixtures of those slightly soluble in water at any...

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