This version (2016/04/28 01:19) was approved by svrijn.The Previously approved version (2016/04/05 15:19) is available.Diff

Elephant Toothpaste


With this experiment we will try to explain how the shape of an container changes the speed of outgoing “toothpaste”.

Description of the Experiment

For this experiment you will need to prepare 2 flasks - a graduated cylinder and a boiling flask with a narrow neck. This experiment is going to create a big mess, so be prepared for that. Mix hydrogen peroxide, detergent, food coloring and finally potassium iodide. You should observe 2 different kinds of “toothpaste” flow.

The graduated cylinder is going to create a slow flowing foam. On the other hand, while using the boiling flask with a narrow neck, you can observe fast, high-level flow, which can reach up to few meters height caused by the narrow neck.

Safety Information

Be careful with usage of hydrogen peroxide. It is possible the foam will contain enough hydrogen peroxide to harm your skin.

The reaction is exothermic, so mind that as well to prevent oneself of getting burned.

There is a small possibility of a glass breakage.

Equipment and materials

- 30% hydrogen peroxide

- potassium iodide (solution)

- detergent

- graduated cylinder

- boiling flask with narrow neck

- food colouring (just to add colour to outgoing foam)

experiments/elephant_toothpaste.txt · Last modified: 2016/04/28 01:19 by svrijn
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