Green challenge
Method
Take a test tube and fill with two fingers of the base.
Now see the teacher for three drops of universal indicator.
Now add the acid.
Observations:
1. When we added the universal indicator to the base the colour changed to blue.
2. When the solution was neutralised by the acid the colour changed to green.
The most difficult thing about this challenge was that if you added one drop too much then the mixture would not be the right colour.
Rainbow challenge
Method
Take a test tube, the base and the acid and universal indicator and create a the best rainbow in a test tube you can manage.
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