The crystallization phenomenon

An interesting crystallization phenomenon can be observed in some salts. There are salts that have the property of glowing during crystallization. To demonstrate this phenomenon, you need to have a chemically pure potash and Sulfuric acid potassium in the form of saturated solutions.

An interesting crystallization phenomenon can be observed in some salts. There are salts that have the property of glowing during crystallization

We merge the same volumes of these solutions into a glass beaker, filter and evaporate them until the glass rod immersed in the solution appears on cooling crystals. Put the glass with the solution cooled in another glass with ice water. In the dark, everyone will be able to observe the bright lightning-like light that accompanies the phenomenon of crystallization.

The causes that cause the phenomenon of crystallization have not yet been clarified. It is possible that this can be explained by the friction of crystals and the breakthrough of electric sparks between them, because the crystals are given different charges.

Precisely such a phenomenon of crystallization can be observed using table salt. Dissolve it in water, and take salt so much that there are insoluble crystals on the bottom of the glass. The resulting saturated solution is poured into another beaker and carefully added to the solution with concentrated hydrochloric acid dropwise, using a pipette. The salt will begin to crystallize and thus there will be a glow - in a solution small jets will skip. To notice them, the experience should also be put in the dark.

A similar phenomenon of crystallization is demonstrated by some other salts - potassium chloride, barium chlorate. In all cases, sparks appear only when hydrochloric acid is added. But, perhaps, the most effective experience with a mixture of potassium sulfate and sodium. Mix 200 g of potassium and 80 g of sodium salt and add in small portions to them hot water. When all the crystals have dissolved, leave the solution to cool. The room in which you put the experience must be darkened. The first, very weak sparks will appear even at 600 . Then they will become more and more. When the crystals fall out a lot, you will see a whole sheaf of sparks, but this must wait a long time - sometimes an hour.

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