Thames & Kosmos Glowing Chemistry handleiding

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Thames & Kosmos

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Handleiding

EXPERIMENT 21

Mysterious Glow

Glowing galaxies

YOU WILL NEED

› Safety goggles

› Luminol

› Potassium hexacyanoferrate(III)

› Sodium carbonate

› 2 Test tube

› Petri dish

› Double-headed measuring spoon

› Pipette

› Hydrogen peroxide

› Dish soap

HERE’S HOW

1. Add a small measuring spoon each of luminol

and potassium hexacyanoferrate(III) and one

large spoon of sodium carbonate to one test

tube and mix the dry chemicals together.

2. Fill the other test tube with water and add a

little dish soap. Now use the pipette to drip

this soap mixture into the Petri dish until it is

just covered with a thin film of soapy water.

3. Darken the room, switch on the red light, and

wait a few minutes. Sprinkle the dry chemical

mixture lightly over the Petri dish with the

spoon built into the lid of the test tube.

4. Switch off the red light and drip the hydrogen

peroxide into the dish with the pipette.

WHAT’S HAPPENING

Galaxies will appear in the Petri dish and a chemical universe of stars will

start to shine! The chemical mixture partially dissolves in the film of soapy

water. As soon as you add the hydrogen peroxide, it triggers the light

reaction and it’s time to sit back and enjoy the star-studded light show.

Luminol

Potassium

hexacyano-

ferrate(III)

Sodium carbonate

Hydrogen peroxide

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