Extracting Cabbage Juice
THIS NEEDS ADULT SUPERVISION AS WE WILL BE HEATING
You will need:
- some red cabbage leaves
- a sharp knife or scissors
- a saucepan or equivalent ( must be able to heat it)
- a camping stove or cooker
This is what you do:
- cut up the red cabbage leaves into pieces of about 1 - 2 cm length
- place the cabbage in the saucepan
- add enough water to cover the cabbage + 2 cm
- heat until boiling
- reduce the heat and simmer for 5 minutes or until the cabbage water has a strong colour.
- remove from the heat and allow to cool
- when cool enough to handle use a sieve to separate the coloured juice from the cabbage
- divide up the juice into small samples and try adding different substances to produce different colours
This is what we did!
This is what we found out
The tekkie bit..
We used a sieve or strainer to separate the boiled cabbage from the solution. The sieve or strainer acted as a filter.
Activity 3. Complete the quiz below
Several different acid/alkali indicators exist. In this post we introduce a few of them and look at the colour changes they give. Universal indicator is similar to cabbage juice in that it gives a range of colours - but neutral solutions give a green colour and purple is alkali. How does this compare with cabbage juice?