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The Dyhydration of cyclohexanol.

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Introduction

THE DYHYDRATION OF CYCLOHEXANOL Aim: find out how much cyclohexene can be got from dehydration of cyclohexanol. Hazard analysis: Sodium chloride: harmful, irritant. Hydrocarbon (cyclohexene and cyclohexanol): highly flammable, harmful, irritant. Potassium Manganate: harmful, danger with metal powder. Phosphoric acid: corrosive and danger with water. Bromine: very toxic, corrosive and danger with potassium and sodium. Introduction We are going to use dehydrating agent phosphoric acid to dehydrate the cyclohexanol to cyclohexene plus water and we then distill it to get the cyclohexene out and calculate the percentage yield. Equation involved C6H11OH C6H10 + H2O H3PO4 C6H10 + H2O C6H10 CaCl2 Method 1. Place 0.1 mol of cyclohexanol in a flask and add 4cm3 of concentrated phosphoric acid by using the pipette while shaking the flask. ...read more.

Middle

Set up the separating funnel as below 3. Pour the distillate into a separating funnel and add an equal volume of a saturated solution of sodium chloride. Shake the funnel and allow the two layers to separate. Run off the lower aqueous layer and then run the top layer cyclohexene into a small conical flask. They are separated because of the density different. Add two or three pieces of anhydrous calcium chloride and stopper the flask. It is to be able get rid of the water. 4. Weight the flask that we are going to collect the product by using electronic balance 5. Decant the alkene into a clean flask and redistill it, as what we have done in 1, the only different is distil it between 80-85oC. ...read more.

Conclusion

Results Calculate the percentage yield Theoretical yield: As cyclohexanol : cyclohexene is 1: 1, and their Ar are 100 and 82. so the yield come out should be 8.2g. Percentage yield= the product we get/ theoretical yield=2.695/8.2* 100%= 32% The reaction with bromine is positive,as the yellow color solution turns to colorless. The reaction with mangnate is poitive, as the purple color solution change to green. Conclusion. The percentage yield we get are quite low. It is because there are lots lose in between we transfer the liquid from one flask to another. As well as this, during the distillation, when there is only a little liquid left in the flask, it is really difficult to distill it. As far as, we distilled twice, so I believe the loss from there is the most effective part. Amy Chan Chemistry practical Page 1 ...read more.

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