chemsample-lab1-introducution


 * __Dehydration of Cyclohexanol__**

The main point of this lab is to dehydrate cyclohexanol to create the new compound, cyclohexene. This experiment can be completed by using a distillation apparatus. The process of condensation will take place during this experiment and we will be able to collect our product in liquid form. This apparatus is so significant because the presence of heat is the catalyst which causes dehydration to take place, but this will also create a gas. The distillation apparatus will then take the new product, now a gas, and transform it back into a liquid. This is important because without this step it would be very hard to measure the correct amount of product due to it being lost within the atmosphere. Now that you understand the tools we used and why we used them for this experiment we will cover some key concepts:

(CH2)5CHOH → C6H10 + H2O (note – that (CH2)5CHOH is in Conc. H2SO4 / ∆) One this process is completed you are going to calculate the //theoretical yield// (aside from purity of your isolate, this is the most important part of the lab). A comparison between your actual yield and the ideal yield gives the group an idea of how pure your product was and if you might have gone wrong somewhere during your experiment.

Cyclohexanol: mol mass, 100.16 g/mol, density, 0.948 g/mL Cyclohexene: mol mass, 82.15 g/mol, density, 0.811 g/mL [0.948 g/mL][3.0] = 2.844 g cyclohexanol [2.844 g][100.16 g/mol] = 0.0284 mol cyclohexanol The ratio in the reaction is 1:1, so, [0.0284 mol][82.15 g/mol] = 2.33 g cyclohexene

So what this means is that 2.844 g of cyclohexanol will at maximum efficiency yield 2.33 g cyclohexene. Note, that during the procedure (depending on the amount of reagents used) your theoretical yield will change. We calculated the proper theoretical yield for the proper amount of reagent(s) you are using.

So now get started! Assemble your distiller (which is diagrammed out for you), add your chemical reagents, and watch the condensation take place. Then of course don't forget run some simple chemical & analytical “purity” tests, and compare your experimental yield to the theoretical yield of a dehydration that occurred with maximum efficiency. Return to Dehydration Lab __Chem Kids Home __