Making Indicators:
Aim: To make acid-base indicators using everyday substances.
Method:
For cabbage:
1. Chop the cabbage into small pieces until you have enough to fill 2 cups.
2. Place the cabbage in a large beaker and add water to cover the cabbage.
3. Boil over a Bunsen burner for at least ten minutes for the colour to leach out of the cabbage.
4. Filter out the plant material to obtain a red-purple bluish coloured liquid. This liquid is about pH 7. (The exact colour you get depends on the pH of water)
5. Place in a small beaker and leave to one side.
Discussion:
After the cabbage was boiled, we used a pipette and placed the cabbage indicator into two holes. We did the same thing for tea, tumeric, cranberry juice, and beetroot. We than
dropped HCI(Acid) into one of each indicators and for the rest we dropped NaOH(Alkali(Base) into it. Here are the results.
Discussion:
After the cabbage was boiled, we used a pipette and placed the cabbage indicator into two holes. We did the same thing for tea, tumeric, cranberry juice, and beetroot. We than
dropped HCI(Acid) into one of each indicators and for the rest we dropped NaOH(Alkali(Base) into it. Here are the results.
Overall doing this experiment was a fun experience, but we did manage to do our aim.
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