The bubbles and remaining liquid can all be safely washed down the sink. Notice how the bottle feels warm to the touch, the chemical reaction created a little heat too, it is an exothermic reaction. Since the mixture contains washing up liquid, the soap traps the oxygen gas in loads of tiny little bubbles which squeeze out the top of the bottle. Hydrogen Peroxide contains hydrogen and oxygen and the yeast allows us to extract the oxygen. Elephant toothpaste is the foaming chemical reaction produced when you mix dish soap, hydrogen peroxide, and dry yeast. Now (using a funnel if you need to) pour the yeast mixture into the drinks bottle and watch as foam starts to build until it pops out the top of the bottle like elephant’s toothpaste.
Pour half a cup (about 100ml) of the hydrogen peroxide into the drinks bottle and add a good squirt of washing up liquid. You will need to wear safety goggles as a precaution but do not place your face over the bottle as you perform the experiment. Put it to one side and get hold of an old (clean) drinks bottle. Mix three tablespoons of warm water with four level teaspoons of yeast until it has mixed together as a thick liquid. You will also need some yeast from your local grocery store and some washing up liquid. This can be bought from your local chemist as it is a chemical often used for first aid. The experiment uses a highly corrosive substance, hydrogen peroxide, which can cause skin irritation and burns. When conducting the elephant toothpaste experiment, it is important to be aware of the potential hazards involved.
For this experiment you will need some hydrogen peroxide (6-9% strength is best but no stronger). The elephant toothpaste experiment is safe to touch after 3 minutes.
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