Density Column

 

 

Density Column Version 1

Summary:  3 immisible liquidsof different densities are in a sealed cylinder.

 

Chemicals and Solutions: 

Bis(2-chloroethyl)ether

Water

Mineral oil

 

Materials: 

One large cylinder with the above mentioned liquids

 

Procedure: 

This is a display. The column consists of 3 liquid layers with dyes.  The cylinder can be shaken and it will separate over time.  The order of density from least dense to most dense is:

Liquid/Solid:

Density in g/mL or g/cm3

Bis(2-chloroethyl) ether

1.456

Water

0.998

Mineral Oil

0.8

 

Hint:  It takes a while to separate fully.  If you shake the cylinder, do so early in the lecture.

 

ReferencesShakhashiri Chemical Demonstrations Vol 3 pg 225, 1989,  The University of Wisconsin Press, Madison Wisconsin

Density Column 2

Summary:  Three level density column is made in class.

 

Hazards: 

Iodine can cause burns.

Chloroform is a possible carcinagine

Copper Sulfate is an Irritant

 

Chemicals and Solutions: 

Ethyl Acetate

Water

Chloroform

Iodine

CuSO­4

 

Materials: 

2 Ungraduated Cylinders

deflagrating spoon

 

Procedure: 

Two Ungraduated cylinders will be provided with the three liquids inside.

Liquid

Density in g/mL or g/cm3

Ethyl acetate

0.897

Water

1.00

Chloroform

1.48

Using the deflagrating spoon Copper Sulfate is added to the aqueous layer (center) and gently stirred.  Copper sulfate is only misible in the aqueous layer and will show a floating blue layer.  Iodine is then added to the other cylinder which is misible in the organic layers.  An orange and red solution will be seperated by the colorless middle aqueous phase.  The iodine and copper sulfate will then be added to the corrisponding cylinder to make an orange/blue/red column.

 

Hint:  Do not mix the organic layers as they are misible.

 

Disposal:  Organic layers will be combined and sent to EH&S as 1%iodine 99% Ethyl acetate/chloroform.  Aqueous layer will be sent as 1% CuSO4 and 99% water

References:

 

http://www.chem-toddler.com

 

 

 

 

To schedule a demonstration, please send an email to the demonstration lab.

 

Contact:

Eric Camp

Lecture Demonstration Technician

Bagley Hall 171

(206) 543-1606

ericcamp@uw.edu

 

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