One of my sons has been studying acids and alkalis, so we decided to make sherbet, which is a good way to practice how to neutralise an acid substance. All you need is:
- 2 teaspoons of citric acid (you can get this in your local chemist)
- 2 teaspoon of of bicarbonate of soda
- half a sachet of raspberry jelly powder
- 4 teaspoons of icing sugar
Mix all ingredients well (if you get lumps pass it all through a sieve). When the sherbet mixes with saliva (a neutral substance) it produces a tickling effect. You can also put a spoonful of the sherbet into a glass of water so the kids see how it becomes a fizzy drink.
You can change colours and flavours of the sherbet by using orange, lemon or strawberry jelly powder.