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Van Der Waals: Boiling Point and Solubility
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Van Der Waals Attractions:
Boling Point and Solubility
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">Boiling point
and solubility are two physical properties that are determined by van der
Waals attractions. Ever wonder why liquid nitrogen is so cold or why oil
and water don't mix? Explore below. </font>
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<font size="4" face="Verdana,Arial,Helvetica,sans-serif">To the left are
two tiny drops of liquid, one polar and the other non-polar. By heating up
these liquids you can vaporize them (or boil them), causing the molecules
to break free of their van der Waals attractions. You know that something
has been vaporized when most of its molecules have broken free of their
attractions. Pressing the heat and cool buttons will change the
temperature of these liquids.</font>
<p align="center">
<strong><font size="4" face="Verdana,Arial,Helvetica,sans-serif">Try
heating the liquids slowly to see which one will vaporize first.</font></strong><font size="4" face="Verdana,Arial,Helvetica,sans-serif">
</font>
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Cool
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Cool the system down
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<strong><font size="4" face="Arial, Helvetica, sans-serif">Which liquid
boiled first (<em>i.e.</em> had the lowest boiling point):</font></strong>
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The polar liquid boiled first.
The non-polar liquid boiled first.
They both boiled at the same time.
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<html><strong><font face="Verdana, Arial, Helvetica, sans-serif" size="4">Explain how van der Waals attractions affect the boilng point of a substance.</font> </strong>
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<font size="4" face="Verdana,Arial,Helvetica,sans-serif">It is well
known that "oil and water don't mix", but why is that the case? </font>
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<img height="51" width="131" src="oilWaterComp.png">
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<font size="4" face="Verdana,Arial,Helvetica,sans-serif">The model
to the left shows polar water and non-polar oil in a container
together. Press "run" to see how they interact.</font>
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<p>
<font size="4" face="Verdana,Arial,Helvetica,sans-serif">Salad dressing
is typically made from oil and vinegar (primarily water). Use the button
below to "shake up the dressing" and watch what happens to the oil and
water as you let it "settle".</font>
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<input name="Submit" script="script:mw:2:load oilAndWaterMix.mml; run;" value="shake up the oil and water mixture" type="submit">
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<html><strong><font face="Verdana, Arial, Helvetica, sans-serif" size="4">Explain why polar and non-polar substances won't stay mixed with each other?</font> </strong>
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Hint
It has someting to do with the different types and strengths
of London Dispersion and Dipole-Dipole attractions.
Hint
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