cups or jars
- white vinegar
- stirring spoon
- 2 cuttings each
of philodendron and begonia plants (one leaf and small
amount of the stem)
- notebook and
- ph paper
Pour 1 teaspoon of vinegar into 2 cups of distilled water,
stir, and check the pH with pH paper. The pH of the mixture
should be about 4. If it is below 4, add a small amount
of baking soda (which is alkaline) and recheck. If it is
above 4, add a drop of vinegar (which is acidic) and recheck.
2. Measure the pH of
the distilled water. If it is above or below a pH of 7,
use vinegar or baking soda to get it to 7.
3. Place one of the
following labels on each cup: Neutral water philodendron;
neutral water begonia, Acid water philodendron, and Acid
Pour a cup of neutral distilled water into the cups labeled
for neutral water.
Pour a cup of acid water into the cups labeled for acid
Put one philodendron cutting in each philodendron labeled
Put one begonia cutting in each begonia labeled cup.
Set the cups somewhere that keep them undisturbed and with
Check the plants every two days, and add more acid or neutral
water if needed.
After a week, compare the root growth of each plant. Record
Compare the roots again after two weeks. Record results.
Discuss the differences.