Thames & Kosmos Hot Ice Crystals handleiding

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Thames & Kosmos

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Handleiding

GEEK

OUT!

WHAT’S HAPPENING?

Even after cooling, no crystals will have grown in the

solution even though it is highly supersaturated. This state is known as

“metastable.” Only once the liquid is disturbed will the crystal salt reveal

itself again in dramatic fashion. You have done that here by adding a few

granules of sodium acetate, which stimulate crystallization by acting as

so-called seed crystals. The solution from Experiment 1 quickly hardens and

lots of needle-shaped crystals will spread out. If you touch the container,

you can feel how it gets warmer. Sometimes, even just a little shaking will

be enough to make a metastable solution crystallize.

TIP!

By reheating the crystallized solution

and adding a few drops of water,

you can keep growing new crystals.

Just don’t let the solution become

contaminated.

2. Creating crystals

in a flash

You will need:

Cooled crystal salt solution from

Experiment 1, petri dish with sodium

acetate crystals left over from

Experiment 1

Here’s how:

The next day, take a look into the

cooled crystal salt solution. If you

did your work carefully, you will

see nothing but a transparent

liquid with no crystals in it.

Remove the lid, pick up the

measuring cup, and gently swirl

the liquid. Does something

happen?

Sprinkle the leftover crystals into

the cup. What happens?

Save the crystallized solution for

the next experiment.

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