Distilling a Mixture of Cyclohexane and Toluene Essay

730 Words Dec 20th, 2012 3 Pages
Distilling a Mixture of
Cyclohexane and Toluene

Lab partner:
Chemistry 211
2/08/12

Goal: The purpose of doing this experiment is to separate a sample of cyclohexane and toluene using simple miniscale distillation. The objectives will be to record boiling range and volumes (mL) of distillates that are acquired during the distillation process. It is expected that cyclohexane boils and distils before toluene. By gathering these measurements will allow us to determine refractive index of fractions collected. An Abbe refractometer will be used to accomplish this.
Data:
Table 1: Distillation Fraction #1: | Fraction #2: | Fraction #3: | Volume (mL) | Temperature (ºC) | Volume (mL) | Temperature (ºC) | Volume (mL) |
…show more content…
After a certain range of temperature we were able to gather fractions of distillates. We knew we had acquired enough of a fraction when we saw a change in temperature. Although there was not a huge gap between temperature for ours, we were able to tell by the amount we knew we had used of each liquid. These temperatures are shown on Table 1 and are also represented in Figure 1 (toluene has highest boiling point). For our second part of the experiment, the instructor provided students with the fractional distillate. The Abbe refractometer was used to determine refractive index. My group’s numbers where not so close to the number provided to us. We decided that this was because we did not use apparatus appropriately. Thus a correction factor was not obtained. My group and I also decided that we had not gathered the exact point at which the cyclohexane distilled.

Figure 1:

During our group’s distillation process, temperature and volume were recorded. The graph above shows graphed data.
Conclusion:
The purpose of this experiment was to use simple miniscale distillation to separate a sample of cyclohexane and toluene. My group and I were able to record boiling range and volumes (mL) of distillates that were acquired during the distillation process. By obtaining these measurements allowed my group and me to determine refractive index of fractions collected. An Abbe refractometer was used to do this. At its best, cyclohexane
Open Document