Dehydrating Cyclohexanol Lab Report

Topics: Sulfuric acid, Laboratory glassware, Distillation Pages: 2 (314 words) Published: March 30, 2011
Mario Troncoso
20025019

Dehydrating Cyclohexanol

Structure/MSDS:

Anhydrous calcium chloride—irritant and hygroscopic

(calcium chloride)

cyclohexanol—irritant and hygroscopic

(cyclohexanol)

cyclohexene—flammable and irritant

(cyclohexene)

Sulfuric acid—toxic and oxidizer

(Sulfuric acid)

phosphoric acid—corrosive

(phosphoric acid)

Results/Data:

End product weighed 0.109g of cyclohexane and tested positive with bromine test

Discussion:

In order to perform this experiment, a distillation apparatus was assembled. 4.0mL of H3PO4 and 3.0mL of cyclohexanol was placed in the round-bottom flask as sell as 5 drops of H2SO4 and a magnetic stir bar. The flow of water was then started through the condenser and the reaction mixture was heated while the magnetic stir rod began stirring. Once distillation was complete and no more liquid distilled, or the thermometer rose above 85 degrees Celsius, the heat was turned off and the products were collected in a small test tube. Once cooled, what was left was an organic top layer and a bottom layer. A Pasteur pipette was used to remove the majority of the bottom layer and was placed into a separate labeled container. Placing .25g of anhydrous calcium chloride into the test tube dried the top organic layer which was then left to stand for 5 min. a clean 5-mL vial was weighed and using a Pasteur pipette, the liquid was removed from the test tube and transferred to the tared sample vial and weighed. In order to properly characterize the cyclohexene obtained a Bromine test was used. 2 Drops of cyclohexene and 20 drops of dichloromethane were placed in a test tube in which 2 drops of Bromine test reagent were added. A positive test was received indicating the presence of cyclohexene.

Conclusion:

In the experiment, cyclohexanol was dehydrated by distillation to yield a product of cyclohexene. The experiment was successful because cyclohexanol was successfully dehydrated to give a...
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