Thames & Kosmos Glowing Chemistry handleiding

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Thames & Kosmos

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Handleiding

4. Fill a test tube halfway with water and add a

small measuring spoon of sodium carbonate.

Clean the measuring spoon and then add a

small spoon of luminol to the test tube. Place

the lid on and shake thoroughly (thumb on

top!) to dissolve as much as possible. Then

use the pipette to fill it up with hydrogen

peroxide. This luminol-hydrogen peroxide-

sodium carbonate solution will be called

light solution in the following experiments.

5. Now darken the room completely, turn on the

red light, and wait a few minutes for your

eyes to get used to the dim light. Pour the

light solution into the bottom section of the

Petri dish, and then use the double-headed

measuring spoon to help maneuver the shape

into the dish. Turn off the red light

immediately.

After the experiment, remove the shape with

the measuring spoon and dispose of it in the

household garbage.

WHAT’S HAPPENING

The shape shines with a light blue light. The

potassium hexacyanoferrate(III) gets the light-

generating chemical conversion process started

— the mixture of other chemicals doesn’t glow

yet. The reason: potassium hexacyanoferrate(III)

is a chemical compound of iron, and this iron

portion (chemists talk about iron-III ions) triggers

the luminol reaction.

Mysterious Glow

Light Solution

Sodium carbonate

Luminol

Hydrogen peroxide

Water

Petri dish

Light

Solution

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