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Mon Sep 11, 2017 6:06 PM
Hello everyone. I am having a problem with the elephant toothpaste. I am using yeast, potassium Iodide, and sodium iodide. These are all working, but i am looking for the wow factor. I have viewed some videos where the toothpaste shoots up out of the bottle. Does anyone know what the catalyst is? The ones i have been using it just oozes out.
10 Activity Points
Tue Sep 12, 2017 5:53 AM
Are you using 30% hydrogen peroxide from a chemical supply (like Flinn)? A long narrow container, like a graduated cylinder also helps. I use potassium iodide and typically get a nice fountain followed by oozing.
71375 Activity Points
Tue Sep 12, 2017 10:10 AM
Jesus, I find much less expensive 30% H2O2 at a local store that sells water purification systems. The concentration is key since the reaction is exothermic enough to auto-accelerate. Be sure you test it with small amounts first, because those higher concentrations of H2O2 present additional hazards.
310 Activity Points
Tue Sep 12, 2017 11:24 AM
I have done all that, but on some videos the toothpaste goes flying out about 10 ft. Any more ideas?
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Wed Sep 13, 2017 7:33 AM
The key to a fast, huge eruption is pressure. If you use a graduated cylinder you do not get as much pressure forcing the material out of the top as you would if you used a large conical flask. Larger reaction area at the base (more gas produced) confined at the neck/mouth of the flask, resulting in greater pressure and a more dramatic eruption.
Steve Spangler has some material on a patriotic demo (https://www.stevespanglerscience.com/blog/2011/07/04/patriot...eroxide/). If you look at the picture you see that they are using conical flasks.
**I get the 30% H2O2 from a pool supply store (Leslie's).
11075 Activity Points
Wed Sep 13, 2017 11:20 AM
Ok. Thank you. I will try it that way. I have been using a graduated cylinder.
Wed Sep 13, 2017 9:22 PM
It also might be the age of your 30% hydrogen peroxide. H2O2 will degrade over time so depending on its age, it will not actually be 30%. When did you purchase your hydrogen peroxide?
58285 Activity Points
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