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Based on solubility, density, and polarity information what will happen if a caffeine extraction and sublimation experiment is carried out at 100°C? (Note: show the outline, the experiment might not work perfectly in the actual lab, but a hypothetical outline is needed).
Procedure below:
Boil 20mL DI water. Place 1st tea bag in beaker taken off heat and cool to handling temperature.
Squeeze tea from bag without breaking it. Boil the mixture. Repeat steps with 2nd teabag.
Cool to room temp. Add 2g sodium carbonate ONLY when water is cool. Stir to dissolve.
Pour solution in centrifuge tube and cool in ice bath.
Add 2mL dichloromethane to tube and then cap. Invert several times and allow tube to vent occasionally.
Let sit and separate.
Pipette the lower, organic layer (the one with the caffeine) into a small flask. Repeat 5-7 2x more.
When you are sure all the dichloromethane is removed, flush tea/aqueous/top layer down the drain. Pour the pure extract into a centrifuge tube. Rinse the flask with dichloromethane and dump into the tube.
Add 4mL NaCl solution to tube and invert several times.
Allow to separate.
Pipette organic layer into new flask and add a small amount of sodium sulfate. Let sit for 5 min until dry.
Weigh a filter flask. Pipette dichloromethane extraction into the flask.
Rinse the sodium carbonate with dichloromethane and dump into the flask.
Evaporate solvent by gently heating in sand bath.
Yellow-green residue will form. Let cool and weigh.
Purify by sublimation.
Use only ~20g
Caffeine sublimation temp is ~180°C
Collect pure caffeine and conduct MP experiment. Find % yield.
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