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I am not sure how to balance $\ce{H_2O_2 + KI + dish soap}$. Is the dish soap involved in the equation or just to show the produced gas? Is it a double replacement or does the $\ce{KI}$ just act as a catalyst and $\ce{H_2O_2}$ is deconstructed to $\ce{2H_2O + O_2}$? It has been a while since I had chemistry.

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Ah!! The elephant toothpaste experiment. First thing first, this reaction is actually a decomposition experiment as the following equation.

$$\ce{2H2O2 -> 2H2O + O_2}$$

Second, $\ce{KI}$ acts as a catalyst in this experiment. You also can use $\ce{MnO4}$ too as the catalyst for this experiment.

Third, the dish soap makes the product of the experiment more soapy and bubbly. So, you can see it will create look like a toothpaste. If you didn't put the dish soap, it will only look like gas bubbling out if the solution.

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    $\begingroup$ I haven't seen this reaction, but I'd expect a solution that was white and somewhat opaque like milk, i.e milky. I wouldn't think that the solution would get thick like a toothpaste. $\endgroup$ – MaxW Mar 17 '16 at 5:24
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    $\begingroup$ It's not viscous like toothpaste. You should search one vudeo and see how is it. $\endgroup$ – Simon-Nail-It Mar 17 '16 at 6:56
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    $\begingroup$ Here is one such video. sciencebob.com/fantastic-foamy-fountain Really looks more like canned shaving cream and is expelled from the container. $\endgroup$ – MaxW Mar 17 '16 at 7:21

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