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What if you had the power to simply touch a liquid... and make it freeze... right before your eyes... and what if the ice created was hot...

Introduction:

Did you ever secretly pour an extra spoonful of sugar into your Kool-Aid when you thought mom wasn't watching but get caught when she saw the undissolved sugar at the bottom of the glass? When you pour sugar in water, the sugar will continue to dissolve as long as there is enough water to support it. When there is more sugar than water, the solution is said to be saturated. However, if you heat the sugar water solution, you can actually get more sugar to dissolve. When the solution is then cooled, the sugar remains in the solution. This is then called a supersaturated solution, which is very unstable and will crystallize easily.Crystallization is the formation of solid crystals precipitating from a solution. The sugar in the water will make small crystals as it precipitates out of the solution.


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Hot ice?


If touching the crystallizing “ice”, you will realize it is very hot. You may be wondering "How come the ice is hot"? The answer is actually pretty simple. As we have learned, the lattice energy is defined as the amount of energy required to separate a mole of the solid (s) into a gas (g) of its ions. However, this is a crystallizing process, which is the reverse of lattice energy. Instead of sucking energy in, the process releases energy, and is called the energy of crystallization. That makes the “hot ice”.

Chemistry Background Information:

Materials Needed:

Beaker

Refrigerator

Stirring Rod

Graduated Cylinder

Distilled Water

Sodium Acetate Trihydrate


Procedure:
Measure 50 ml distilled water into a clean beaker. Heating the water until boiling.
Add enough sodium acetate trihydrate crystal until the solution is supersaturated. (300g of sodium acetate tryhydrate will guarantee a supersaturated solution.)
Put the solution in a fridge until it cools down.
Finally give the solution a “rough surface” to make it crystallize.

Frozen Heat from adriantorres on Vimeo.



Additional Resources:

References/Useful Links :

http://en.wikipedia.org/wiki/Crystallization

Pictures:

http://www.geocities.com/crystalgrowing2001/supersat.gif

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