Thames & Kosmos Chemistry C500 (Version 2.0) handleiding

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Handleiding

PLANT DYES

There are many plant dyes, like litmus,

that react to acids and bases by turning

color. This kind of dye is found in

black currants, cabbage,

elderberries, violet flowers, and

black tea. All of these dyes

have a similar chemical

structure.

Note:

Acids turn blue litmus solution

red. Bases turn red litmus

solution blue. The litmus solution

is an indicator (from Latin

“indicare,” to show or display) for

acids and bases.

Kitchen Excursion:

Tracking down acids and

bases with red cabbage

C Cut a red cabbage leaf into little pieces. Add the pieces to

a pot with ¼ liter water. Now boil the red cabbage pieces

for about 5 minutes under the supervision of an adult.

C Let everything cool completely! C Pour some of the

cabbage broth into a clean yogurt container. Then divide

the cabbage broth between two test tubes. C Add a little

sodium carbonate to one test tube, and add a little vinegar

to the other. C Do you see the difference in color?

KEYWORD:

LITMUS

Litmus dye is obtained

from lichens. You may

have seen lichens in the

woods. They can be found

growing on tree bark or

branches, or covering

rocks.

22 | Acids and Bases

CHECK IT OUT

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