Thames & Kosmos Kids First: Crystals, Rocks & Minerals handleiding

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Handleiding

WHAT’S HAPPENING

Crystals like to deposit themselves on the rough surface of a

rock — as they do in nature — and form beautiful shapes there

over the course of days or weeks. The copper sulfate crystals

are particularly impressive in their color and form.

2 3

6 7

Artificial mineral

layer

YOU WILL NEED

›  Small measuring cups

› Copper sulfate

› Double-ended measuring spoon

› Wooden spatula

› Display box

› Small rock with a rough surface

› Distilled water

› Sheet of paper

› Pencil

HERE’S HOW

1. Dissolve 30 small spoonfuls of copper

sulfate in a small measuring cup with 20 ml

water.

2. Place the granite rock in it. The rock should

be completely submerged.

3. Let the container stand uncovered for a few

days in a safe spot where younger children

and pets cannot get to it. Use the paper and

pen to make a label for the solution. Blue

crystals will form. Most of them will be

lying on the bottom, but if you’re lucky

there will be some on the rock.

4. If so, pull the rock out carefully with the

help of the spatula, and put it in the second

measuring cup.

Redissolve the crystals remaining in the first

cup with a little warm distilled water. Be

sparing with the water: The solution has to

be absolutely saturated, or the crystals on

the rock will dissolve again!

Pour the solution over the rock again so that

it is completely covered. Let crystals form.

7. When you are done, remove your crystal

specimen, let it dry, and place it in your

display box.

8. Let the rest of the solution evaporate, and

return the copper sulfate to the vial.

TIP !

If you are not pleased

with your crystals,

simply redissolve

them and try again. A

solution of  small

spoonfuls of

potassium

hexacyanoferrate

(III) in  ml of water

will form deep-red,

crooked crystals. Be

sure to recover any

leftover chemicals

through evaporation,

and put them back

into their storage

containers.

20 ml

For copper sulfate, note the

information about hazardous

substances on page 6.



Homemade Crystals

EXPERIMENT 5

Bekijk gratis de handleiding van Thames & Kosmos Kids First: Crystals, Rocks & Minerals, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.