Experiment G - Oil of Cloves
[Flow Diagram, Part I]
[Flow Diagram, Part II]
[Crude oil IR]
|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.
©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
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!)