Salting Out Ethanol From Water - Nc State University

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NCSU – Dept. of Chemistry – Lecture Demonstrations
Organic Chemistry
Salting Out Ethanol from Water
Description: A mixture of ethanol and water is made immiscible by the addition
of potassium carbonate.
Materials:
Deionized water
Test tubes
Ethanol
Bromothymol blue
K
CO
1 M HCl
2
3
Procedure:
1. Prepare a large test tube with 10 mL ethanol, 10 mL water, a few drops of
bromothymol blue indicator and one drop of 1 M HCl. The solution is
homogeneous and yellow.
2. Add 3 g of K
CO
to a second test tube and pour the solution from step 1
2
3
into this test tube. The test tube is sealed with a rubber stopper and
mixed thoroughly with shaking. At this point the solution will become
biphasic and the organic phase will be blue. Alternatively, this reaction
can be scaled up in large graduated cylinders.

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