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

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Handleiding

WHAT’S HAPPENING

In fact, potassium hexacyanoferrate (III)

does form beautiful, deep-red crystals

out of an intensely yellow solution.

Blood-red shapes

YOU WILL NEED

› Potassium hexacyanoferrate (III)

›

Small measuring cup

› Double-ended measuring spoon

› Wooden spatula

› Display box

› Old glass jelly jar

› Distilled water

› Sheet of paper

› Pencil

HERE’S HOW

1. Dissolve 30 small spoonfuls of potassium

hexacyanoferrate (III) in a small measuring

cup with 15 ml water.

2. Leave the yellow solution to stand

uncovered for a few days in a protected

place. It will form deep red crystals. Use the

paper and pen to make a label for the

solution.

3. After the crystals have formed, pour the

solution into the jelly jar and label it.

4. Use the wooden spatula to pull out the

prettiest crystal for your display box.

5. Let the remaining solution completely

evaporate, and return the dry potassium

hexacyanoferrate (III) to the vial.

TIP !

Caution — this

crystal solution

causes stains.

ABOUT

POTASSIUM

HEXACYANO

FERRATE

(

III

)

Prussian red has

an iron atom in its

molecule to thank

for its color. It is

used, for example,

in photography,

for the production

of architecture

blueprints, for wood

stains, and as a

hardening agent for

steel. It is also a very

sensitive indicator

for iron compounds,

a quality that will

help you in the next

experiment.

15 ml



EXPERIMENT 4

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