Tuesday 28 May 2019
Making Indicators
Aim: To make acid-base indicators using everyday substances.
Method for Beetroot
1. Chop The beetroot into small pieces until you have enough to fill 2 cubs
2. Place beetroot in a large beaker and add water to cover it
3. Boil over a Bunsen burner for at least ten min for colour out of the cabbage
4. Filter out the plant material to obtain a red-purple-bluish coloured liquid. This liquid is at about pH 7
5. Place in a small beaker and leave to one side
Equipment:
Beetroot, a beaker, water, tripod, Bunsen burner, Gansen mat,
Results Acid Base
Beetroot Yellow Yellow
Cabbage Red, pink Green
Tea Yellow Yellow
Tumeric Yellow Red
Cranberry Yellow Green
Discussion: We went through the process of adding different chemicals to our everyday substance indicators and each chemical changed to show us if it was a strong base, weak base or strong acid and weak acid by colour changing.
Conclusion: We made our indicators to show what chemicals are acids and bases. I think that beetroot worked better.
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