| Experiment G - Oil of Cloves |
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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. |
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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. |
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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.
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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.
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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!
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©2001,2002 Daniel A. Straus
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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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