Thames & Kosmos Ooze Labs: Chemistry Station handleiding

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Handleiding

Invisible ink

YOU WILL NEED

2 small test tubes, chemistry station, spatula,

filter paper, petri dish, pipette, baking soda, wa-

ter, cabbage juice (from Experiment 7), house-

hold vinegar, cotton swab

HERE’S HOW

1. Fill a small test tube half full of water and

put a small scoop of baking soda into it.

2. Fill a second test tube with cabbage juice to

a height of two centimeters. Add a few drops

of vinegar.

3. Place the filter paper on the petri dish. With

the pipette, drip the red cabbage and vinegar

mixture onto the paper until it is completely

colored. Then wait until it has dried

completely, which may take a whole day.

4. Dip one end of the cotton swab into the

baking soda solution. Use the wet end of the

swab to write or draw on the dry, colored

filter paper. Observe what happens.

WHAT’S HAPPENING

When you write with the baking soda solution on

the cabbage juice soaked filter paper, the writing

will appear greenish, even though the solution is

colorless. As you already know, cabbage juice is

an indicator and can indicate whether

something is acidic or basic. Because of the

baking soda, the water applied to the filter

paper is basic, so it discolors the indicator.

› › › EXPERIMENT 16

Ooze Labs Chemistry Station

Bekijk gratis de handleiding van Thames & Kosmos Ooze Labs: Chemistry Station, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.