Sodium Acetate is really cool because it has a "freezing" point of around 130°F (54°C). By heating the sodium acetate in water, you're bringing it past it's melting point. When you cool it, you're actually supercooling it below it's freezing point without letting it crystallize.
Once you touch the solution, a nucleation site is formed, allowing it to recrystallize. The solution quickly jumps to its freezing point once the crystallization process begins, bringing it back up to about 130°F (54°C).
To reproduce the experiment, you can buy some sodium aceteate or if you'd rather make it yourself, sodium acetate is one of the byproducts of mixing baking soda and vinegar.
Once you touch the solution, a nucleation site is formed, allowing it to recrystallize. The solution quickly jumps to its freezing point once the crystallization process begins, bringing it back up to about 130°F (54°C).
To reproduce the experiment, you can buy some sodium aceteate or if you'd rather make it yourself, sodium acetate is one of the byproducts of mixing baking soda and vinegar.
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