The Red-Cabbage Indicator

Objective:

The object for my experiment is to test whether a substance is a an acid or a base according to their ph level. I will test the substances using red-cabbage juice called flavin, which is a natural ph indicator. When an acid reacts with the red-cabbage juice it would typically produce a reddish- pinkish color. When a base reacts with the juice is will typically produce a greenish color. And when a substance is neutral is will typically produce a bluish-purplish color. According to the color the substance changes, will I then be able to determine if it

is an acid or base.

Procedure:

1. Set out all materials, and place them in order on your workspace. Then carefully fill each beaker half-way with each testing substance.
2. Pour the indicator into a glass or cup and insert a dropper.
3. One-by-one drop the indicator into each beaker, and watch the color change.
4. Using a pen and paper record your observation of what color each substance appears to be.
5. Determine whether a each substance is an acid or base according to which color they apparel to be.
6. When you are done, arrange the beaker for lightest acid, to neutral color, then darkest to lightest base.
7. After this clean up your work space, and make sure to thoroughly wash out all beakers, and droppers.

You have now finished your indicator experiment, I hope that you enjoyed it.

Materials:

5 beakers

3 droppers

red-cabbage juice

lemon

alker-seltzer( do not eat by itself)

ammonia ( not for children is highly flammable)

vinegar

baking soda (not for children, never eat by itself)