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Cabbage Water Tester Experiment
OBJECTIVE:
Students will test PH levels of some household products.
MATERIALS:
red cabbage 2 clear glasses
2
bowls orange juice
hot water apple juice
knife soup broth
lemon juice egg white
baking soda coke
colander cream of tarter
eye dropper vinegar
tea
PROCEDURE
1.
Cut cabbage into small pieces. Place in bowl and cover with
two cups of very hot water. Let stand 15-20 minutes or until the
water turns purple.
2.
Separate mixture by pouring through a colander in another
bowl. This will be the indicator.
3.
Pour a small amount of the indicator into a glass. Add a few
drops of lemon juice. Note the color change. This will be the
acid.
4.
Pour a small amount of the indicator into another glass and
add a pinch of baking soda. Note the color change. This will be
the base.
5.
Rinse out the glasses and experiment with the other items.
Mix the acidic and the bases together, see what
6.
Some items will not change the color of the indicator – these
are neutral.
DISCUSSION
Share results as small groups or individuals. (It depends how you’d
like to do this experiment. It can be a demonstration or be done in
groups of 4-5 students).
Identify each household item as either a base or acid.
EXTENSION
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Test each item using the PH kit or PH test paper.
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Chart your results using cut-out pictures of each item.
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Display charts in class for all to see. |
