A simple and quick way to demonstrate the general law of crystallization
Abstract
The general law discussed here is that a crystal falling out of solution tends to take on the smallest surface area. This law, which has a simple and well-known theoretical basis, is usually demonstrated by examples of crystallization, or rather recrystallization, which requires a long time, even months, or at least days. I have come across a preparation in which this demonstration can last for several seconds. This drug is sodium nitrate, microscopic crystals of which dissolve from breathing in a few seconds and crystallize at approximately the same time due to evaporation. Thanks to this speed, of course, the mentioned law сan be also quickly demonstrated.
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