Sodium acetate trihydrate experiment

There is something going on now, and I want to do an experiment with sodium acetate trihydrate as the main thing.

Prepare a number of sodium acetate trihydrate first, and a clean container is required. Place the sodium acetate trihydrate in the container and heat it slowly. Looking at its shape, you can see its gradual melting. This is the state of melting due to heat.

When it is completely melted, stop heating, let it sit in a stable place, and let it cool slowly. At this time, it can be seen that it gradually coagulates. When it coagulates to a certain extent, if it touches it with an object or moves the container slightly, in an instant, there seems to be a miraculous change. The molten liquid crystallizes rapidly, as if it solidifies instantly, and its shape is very

The reason is that the melt of sodium acetate trihydrate should have crystallized when it was cooled, but it was in a supersaturated state due to the lack of a suitable crystal nucleus. And the external object touches or vibrates the container to provide the crystal nucleus, which prompts it to crystallize rapidly. This is a strange scene. Although this experiment is simple, the wonderful changes in it are enough to make people think deeply about the principle of material changes.