Experiment G - Oil of Cloves

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Step-by-Step Overview:

Experiment G - Oil of Cloves
  You will be given some whole cloves in a small jar. Use all the cloves you are given. Weigh the sample of cloves. Return the jar to the instructor.
  Using the electric spice grinder, pulverize your whole cloves. You may notice that the plastic on the lid is degraded. This is because the clove oil breaks down the plastic. While it may be preferable, in this sense, to use an agate mortar and pestle, for expediency the electric grinder will be used in lab.
  After placing your whole cloves into the grinder, close the lid and press the white button to grind. (Make sure the grinder is plugged into the outlet.)

 Using a wide stemmed funnel, place your cloves into a 500 mL round bottom flask.

  Set up your apparatus for codistillation with water. Use a Claisen connecting tube to accommodate the addition funnel so that portions of water can be added throughout the distillation to make up for lost volume.  You will need to check out a large heating mantle from the Service Center to accommodate the large round-bottom flask. Be sure to connect the Thermowell via the Powermite thermoregulator (and not directly into the electrical outlet).

You will not need boiling chips.

  Collect the distillate in a 250 mL Erlenmeyer flask. Distill off about 150 mL rather than continuing until the distillate becomes clear.
  • Note that the bottom hose is connected to the water tap and the top hose leads the water into the sink. (The drain hose is held in place at the sink end to avoid floods by a loose-fitting iron ring.) (A few drops of acetone will help the hoses to slide onto the glass hose nipples.)

Make sure to keep the water flow at a minimum to avoid overflow of the sinks.

  • Grease all ground glassware joints as you assemble the apparatus.
  • As in other distillation setups, don't over clamp!
 

©2001,2002 Daniel A. Straus

The optimal codistillation will proceed when the round-bottom flask is kept about 1/2 to 2/3 full throughout the distillation. Keep adding portions of water from the addition funnel. Make sure that the distilland does not boil up above the neck of the round-bottom flask, or you will have clove residue boiling over into the distillate (not desirable).

Notice the placement of the thermometer head.

(When finished, allow the apparatus to cool before disassembling. Also make sure that the heating mantle is sufficiently cool before returning it to the Service Center. Be thoughtful of the Service Center staff!)

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