Step 1: Hypothesis: I believe the cabbage in the cabbage soup changes color to green when it comes in contact with certain other substances. I also believe there must have been traces of one of these substances in my water.
Step 2: Supplies:
you will need:
- 9 plastic cups
- a red cabbage
- a pot
- distilled water
- paper towls
- a plastic spoon
- a dropper
- baking soda
- a clear soft drink
Step 3: Step 1. Preparing for Soup:
Important note: Be sure to use DISTILLED WATER not tap water.
I gently wiped out the pot with a dry towel. I poured some distilled water into the pot and made circular motion with the pot to clean it. I dumped it and repeated the water step once more to ensure that nothing was left behind. It is not necessary to rinse the red cabbage.
Step 4: Step 2. Making The Soup:
I added a cup and a half of distilled water to the pot. I heated it to just barely boiling. Next I added about three leaves and cooked them for three to five minutes until they lose their color. Look at the picture that compares faded to fresh. Then I fished them out and added more leaves. I repeated this until I had used about ten full leaves.
Notes: I made a small batch of soup. It might be a good idea to make more soup depending on the size of the cups you intend to use.
Step 5: Step 3. Preparing To Mix:
I started by lining up the test items on a table in no partcular order. I placed a layer of paper towels across the table in front of the test items and lined up one cup across from each item. I wrote the corresponding abbreviation on it. Example: On the one across from the vinegar I wrote, vin. Then I filled each cup with an equal amount of soup.