Thames & Kosmos Chemistry C500 (Version 2.0) handleiding

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Thames & Kosmos

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Handleiding

First blue,

then red

YOU WILL NEED

→ 2 test tubes

→ measuring spoon

→ stopper

→ pipette

→ litmus solution

→ sodium carbonate

→ tartaric acid

→ cup of white vinegar

→ cup of water

HERE’S HOW

1. Fill a test tube halfway with water and

add 5 drops of litmus solution. Close the

test tube with the stopper and shake so

that the litmus solution is evenly

distributed.

2. Color the blue solution light red with 2

drops of vinegar from the pipette.

Divide the solution between two test

tubes. You will need one of them now,

and the other for the next experiment.

3. Add 1 small spoonful of sodium

carbonate to one of the test tubes.

Shake the solution a little.

What do you see?

4. Now add 2 drops of vinegar with the

pipette.

What do you see now?

The litmus dye is apparently unharmed

by all this to and fro. Instead, it indicates

whether acid (light red) or base or alkali

(blue) has the upper hand. Some alkali

(sodium hydroxide, or soda lye) is

created when the sodium carbonate

dissolves in water.

VINEGAR

SODIUM

CARBONATE

VINEGAR

Safety Note:

For sodium carbonate and tartaric acid,

note the “Information about hazardous substances” on

page 7!

1/2

WATER

→

WHAT’S HAPPENING?

Acids and Bases | 19

EXPERIMENT 8

LITMUS

SOLUTION

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