Thames & Kosmos Glowing Chemistry handleiding

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Thames & Kosmos

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Handleiding

EXPERIMENT 15

WHAT’S HAPPENING

The liquid will glow for a few seconds

with a mysterious blue light, but then the

glow will quickly fade. The cause of the

glow is a chemical interaction of the

luminol with the hydrogen peroxide, with

light emitted in the process. The name for

this phenomenon is chemiluminescence.

As with many chemical reactions, it

releases energy. But unlike the

combustion of wood, for example, in

this case the energy is released as light

rather than heat.

Solution 1

Sodium

carbonate

Luminol

Water

Solution 2

Potassium

hexacyanoferrate(III)

Water

Hydrogen peroxide

Magical light

YOU WILL NEED

› Safety goggles

› Luminol

› Sodium carbonate

› Potassium hexacyanoferrate(III)

› 2 Test tube

› Double-headed measuring spoon

› Pipette

› Petri dish

› Hydrogen peroxide

HERE’S HOW

1. Fill a test tube three-quarters of the way

with water and add a small spoon of sodium

carbonate. Clean the measuring spoon and

add a small spoon of luminol. Place the lid on,

set your thumb firmly over the lid, and shake

thoroughly until everything is as well

dissolved as possible (Solution

2. Fill the second test tube just about halfway

with water, and add hydrogen peroxide with

the pipette to bring the level to about three-

quarters full. Then sprinkle a small spoon of

potassium hexacyanoferrate(III) into it, put on

the lid, and shake until everything is dissolved

(Solution

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

wait a few minutes for your eyes to adjust to

the darkness. Then pour both solutions one

after the other into the Petri dish and switch

off the red light.

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