Thames & Kosmos Grow a Crystal handleiding

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Thames & Kosmos

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Handleiding

EXPERIMENT 1

Making Colorful Crystals

YOU WILL ALSO NEED:

› Scissors, tap water or distilled water

(from a supermarket or drug store),

old pot, trivet, oven mitts, clean empty

mason jar (heat-resistant canning jar),

paper towels, old spoon

Before starting, get a trivet ready at

your work station.

1. Open the crystal salt packet

Cut off one corner of the potassium

aluminium sulfate packet with a pair of

scissors. Never use your teeth! Make

sure the printed information remains

intact and legible. Pour the contents

into a clean mason jar. Use the

measuring cup to measure about 90 mL

of water (3 cups of water using the

measuring cup provided) and add it to

the jar with the alum powder.

If the crystal salt has formed

clumps, this does not indicate a

quality problem. It just means that

some moisture (possibly from the air)

has gotten into the packet. This won’t

affect the behavior of the salt. The

salt’s age also makes no difference.

2. Dissolve the crystal salt

Ask a grownup to help you with the

following steps. Fill the pot with

water to a height of about 3-4 cm. The

water level should be below the level

of the water in the mason jar. Place

the mason jar with the alum powder

and water in the middle of the pot.

Bring the water in the pot to a boil.

Switch off the stove and using the

oven mitts carefully set the pot on the

trivet. Stir the solution with the plastic

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