Example+of+Formal+Lab+Report[1] - Lab 712 Dehydrating...

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Lab 712 Dehydrating Cyclohexanol Nov. 23, 2009 John Doe Chemistry 2423 Purpose The purpose of this experiment is to dehydrate cyclohexanol to produce cyclohexene and to characterize the product. Background Elimination reactions result in the loss of a small molecule from adjacent carbon atoms, forming a pi (double) bond. This reaction can be used to form an alkene from an alcohol, with the elimination of a water molecule. This elimination is called dehydration. In this experiment the following reaction is used to produce cyclohexene: (Note: These structures are from a chemical structure drawing program; You may draw the structures by hand – but be neat.) OH + H 2 O H + Aqueous sulfuric acid and phosphoric acid mixture is used as a catalyst. The mechanism is an E1, proceeding by the following steps: H + OH H + + H 2 O +OH H H H 2 O
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Because cyclohexene has a lower boiling point than cyclohexanol, the cyclohexene produced can be distilled out of the reaction mixture as it is formed. Some water will distill over into the collection flask, forming a two layer mixture. Part of it can be removed by a pipette and the remainder absorbed by calcium chloride. The dry and pure cyclohexene will be weighed for a yield calculation. A chemical test for the presence of the double bond between carbons is the addition of bromine solution. If the red bromine color goes away, the test is
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This note was uploaded on 07/25/2011 for the course CHEM 2425 taught by Professor Marthagilchrist during the Spring '10 term at Tarrant County.

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Example+of+Formal+Lab+Report[1] - Lab 712 Dehydrating...

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