Thames & Kosmos Crystal Creation handleiding

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Thames & Kosmos

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Handleiding

WHAT’S HAPPENING

When crystals separate out from the

supersaturated solution, it is especially

easy for them to do so on the rough surface

of the rock. In nature, you can often find

large crystals on chunks of rock. You have

replicated this kind of natural

phenomenon in your experiment.

A B

TIP !

If the salt does not dissolve completely

when heated, add  mL water.

2 3

Granite rock

with crystals

YOU WILL NEED

›  g packet of ammonium biphosphate

› granite rock

› empty, labeled jelly jar

› pot with hot water (no longer boiling)

› paper towels, potholder, and hot pad or trivet

› distilled water

HERE'S HOW:

1. Prepare a hot saturated solution of 50 g

ammonium biphosphate and 100 mL water,

as described on page 8.

2. Carefully lift the jar out of the pot with a

potholder and place the rock into it (rinse the

rock first). Be careful not to make the liquid

splash up!

3. When the solution is allowed to cool in a

quiet spot, crystals will form on the bottom

of the jar and then on the rock itself.

4. Fish out the rock with a wooden spatula

before it has a chance to become stuck in the

crystals growing on the bottom of the jar. If

you like, you can reheat the solution and

repeat the process to let the crystals grow

larger.

5. Finally, remove the rock and let it dry on a

paper towel. Save the remaining solution in

the ammonium biphosphate storage

container. 

Be careful when handling

hot water! Wear your

safety glasses!

100 ml

Water

50 g



EXPERIMENT 5

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