Thames & Kosmos Chemistry C500 (Version 2.0) handleiding

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Thames & Kosmos

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Handleiding

SODIUM

CARBONATE

Safety Note: For sodium carbonate and tartaric acid, note the

“Information about hazardous substances” on page 7!

CARBON DIOXIDE

Carbon dioxide dissolves in

water, producing carbonic acid.

The “magic air” turns the blue

litmus solution red.

HERE’S HOW

You might have to practice this trick a little. If

you want to perform it in front of an

audience, ﬁrst complete steps 1–3.

1. Add 5 drops of litmus solution to 2 cm of

water in the ﬁrst test tube, and shake it a

little.

2. In the second test tube, prepare some

carbon dioxide from sodium carbonate and

tartaric acid as you learned in Experiment

3. Insert the stopper so nothing can escape.

3. Pour the carbon dioxide into the third test

tube. Don’t let any of the liquid get into the

test tube, though. Hold one hand in front of

it so as little carbon dioxide as possible

escapes. Quickly insert the stopper into the

test tube with the carbon dioxide and keep

it ready.

The presentation can start here.

4. “Pour” the carbon dioxide onto the litmus

solution in the ﬁrst test tube. Close the test

tube with the rubber stopper and shake

vigorously.

Magic trick with

“sour” air

YOU WILL NEED

→ 3 test tubes, with stopper

→ measuring spoon

→ dropper pipette

with paper collar

→ litmus solution

→ sodium carbonate

→ tartaric acid

→ cup of water

→

WHAT’S HAPPENING?

EXPERIMENT 11

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