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Making “elephant toothpaste” is an easy and fun science experiment that you can do at home with your kids or with students in the lab. This is the result of a chemical reaction that forms a huge amount of foam. The movement of the foam mass looks like toothpaste spewing out of a tube, and the volume of foam is enough for an elephant to brush his teeth.
Note that concentrated hydrogen peroxide (3% higher concentration than household hydrogen peroxide) is a strong oxidizing agent. It can bleach the skin and cause burns. Do not attempt without proper safety precautions and adult presence.
Have fun with the experiment, but remember to be safe!
Home made version
- 1/2 cup 20-volume hydrogen peroxide solution (20 volume is a 6% solution, which you can find at beauty stores or hair salons)
- 1 tablespoon dry yeast
- 3 tablespoons warm water
- Dishwashing liquid
- Food coloring
- Many bottles in all shapes
Version made in the lab
- Food coloring (optional)
- Washing liquid
- Hydrogen peroxide 30% (H202)
- Saturated potassium iodide (KI) solution
- Measuring tube 1 liter
Steps
Experiment preparation
Perform experiments
- Depending on your child’s age, you can give them a spoon and stirrer. You can also have your child wear goggles and a lab coat. Children’s goggles are available at hardware stores.
- If your children are too young, you should have them pour dishwashing liquid and food coloring into the bottle. You can also add glitter for more fun. Remember to use plastic glitter, not metal-based glitter, as hydrogen peroxide should not be used with metals. [4] X Research Sources
- You can stir the mixture yourself or let your child do it if he or she is old enough. Make sure not to let hydrogen peroxide spill out.
- The fungus present in the yeast will immediately dissociate the hydrogen peroxide and release a large amount of oxygen molecules. The oxygen molecules released are gaseous, and when they encounter soap, they form foamy bubbles, while the rest remains in the form of water. The gas will find its way out and the “toothpaste” foam will spray out of the bottle. [6] X Research Source
- Remember to mix the hydrogen peroxide and yeast thoroughly for maximum effect.
- With a regular soda water bottle and 3% hydrogen peroxide, you get a cascade effect like a chocolate waterfall.
Made in the lab
Advice
- You may notice that the reaction is exothermic. This phenomenon is the result of an exothermic reaction, that is, the generation of energy.
- Use gloves when cleaning “elephant toothpaste”. You can put both the foam and the solution down the drain.
- Hydrogen peroxide (H2O2) will naturally dissociate into water and oxygen over time, but you can speed this process up by adding a catalyst. Hydrogen peroxide releases a lot of oxygen at once when it encounters soap, so millions of tiny bubbles quickly form.
Warning
- Elephant toothpaste can cause stains!
- The formulation is called elephant toothpaste just because of its appearance. Do not put it in your mouth or swallow.
- The foam will overflow suddenly and very quickly, especially in the lab-made version. Be sure to perform this test on a stain-resistant and washable surface, and not stand near the bottle or measuring cylinder while it is bubbling.
- This experiment will not be safe if you do not use goggles and gloves.
Things you need
- Goggles
- Single use gloves
- Clean plastic soda water bottle 480 ml
- Small cup
- Tall cylinder (at least 500 ml)
- Test tube
- Food coloring (optional)
- Soap water or powder
- Hydrogen peroxide 30% (H202)
- Saturated potassium iodide (KI) solution
wikiHow is a “wiki” site, which means that many of the articles here are written by multiple authors. To create this article, 77 people, some of whom are anonymous, have edited and improved the article over time.
This article has been viewed 11,829 times.
Making “elephant toothpaste” is an easy and fun science experiment that you can do at home with your kids or with students in the lab. This is the result of a chemical reaction that forms a huge amount of foam. The movement of the foam mass looks like toothpaste spewing out of a tube, and the volume of foam is enough for an elephant to brush his teeth.
Note that concentrated hydrogen peroxide (3% higher concentration than household hydrogen peroxide) is a strong oxidizing agent. It can bleach the skin and cause burns. Do not attempt without proper safety precautions and adult presence.
Have fun with the experiment, but remember to be safe!
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