EXP6 - 1 Fijany Layla Fijany Chem 12A T/TH 5-10pm 10/1/2011...

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1 Fijany Layla Fijany Chem 12A T/TH 5-10pm 10/1/2011 Purpose : To separate liquids in an unknown mixture by simple and fractional distillation techniques, which will further be analyzed using gas chromatography and constructing a graph of distillation temperature versus the total volume of distillate collected. This will help in determining the approximate boiling points of the two liquids in the mixture. Introduction: Distillation is one of the oldest and still most common methods for both the purification and the identification of organic liquids. It is a physical process used to separate chemicals from a mixture by the difference in how easily they vaporize. As the mixture is heated, the temperature rises until it reaches the temperature of the lowest boiling substance in the mixture, while the other components of the mixture remain in their original phase in the mixture. The resultant hot vapor passes into a condenser and is converted to the liquid, which is then collected in a receiver flask. The other components of the mixture remain in their original phase until the most volatile substance has all boiled off. Only then does the temperature of the gas phase rises again until it reaches the boiling point of a second component in the mixture, and so on. The boiling point of a substance—determined by distillation—is a useful physical property for the characterization of pure compounds. Hypothesis: When the boiling points of two liquids are similar, a simple distillation will not provide a distillate with a pure substance. Therefore, a fractional distillation will yield more accurate results when two unknown liquids have a close range of boiling points. Set Up:
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2 List of Reagents FW (g/mol) BP (˚C) MP (˚C) Density (g/cm 3 ) Other (hazards, uses, etc) Hexane (C 6 H 14 ) : 86.2 69 -95 .6548 - used for glue and extracting oil & grease; evaporates in air (pollutant), highly flammable Cyclohexane (C 6 H 12 ): 84.12 80.7 --- 0.78 - immiscible in water, a colorless liquid with a mild, sweet odor resembling that of chloroform or benzene; flammable Heptane (C 7 H 16 ): 100.2 98.4 -90.6 0.68 - colorless liquid, immiscible in water; highly flammable, readily forms explosive mixtures with air
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This note was uploaded on 02/26/2012 for the course OCHEM 12A taught by Professor Alston during the Fall '11 term at Saddleback.

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EXP6 - 1 Fijany Layla Fijany Chem 12A T/TH 5-10pm 10/1/2011...

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