Thames & Kosmos Glowing Chemistry handleiding

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Thames & Kosmos

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Handleiding

EXPERIMENT 18

Light Solution

Light

Solution

WHAT’S HAPPENING

The coin starts to glow slightly — the

dirtier it was, the brighter the glow.

The coin is coated with copper, and

copper compounds are also capable

of setting off the luminol light

reaction.

Penny in a blue sea

Potassium hexacyanoferrate(III) is not the only

thing that can make the luminol start to shine.

YOU WILL NEED

› Safety goggles

› Luminol

› Sodium carbonate

› Test tube

› Double-headed measuring spoon

› Pipette

› Petri dish

› Hydrogen peroxide

› Penny (one-cent coin)

HERE’S HOW

1. Prepare some light solution (luminol-

hydrogen peroxide-sodium carbonate

solution) as in the last experiment.

2. Pour the light solution into the Petri dish.

3. Darken the room completely, turn on the red

light, and wait a few minutes for your eyes

to get used to the dim light. Then place the

penny in the Petri dish and immediately turn

off the red light.

After the experiment, remove the coin from

the dish with the double-headed measuring

spoon and wash it off.

Sodium carbonate

Luminol

Hydrogen peroxide

Water

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