All those Mentos in a lot of soda make a lot of bubbles that rise to the surface and push the soda out in a big woosh! Mentos and Diet Coke! Have you ever noticed that when you put a straw in soda pop, the straw gets a lot of bubbles on it?
Why does that happen? And will it happen if you put other stuff in soda pop? Place a straw in the soda and look at the straw from the side. What to expect. Bubbles will form on the straw and very quickly and completely cover the pipe cleaner.
What's happening in there? Why do the bubbles form on the different things you put in the soda? The carbon dioxide molecules collect on these places and form bubbles which rise to the surface.
Make a Mentos-and-Soda Fountain! Measurements of the pH of the Coke before and after the experiments showed that its acidity did not change, ruling out the idea that a simple acid-base reaction drives the fountains. Instead, the vigour of the jets depends on various factors that affect the growth rate of carbon dioxide bubbles. The rough, dimply surfaces of Mentos encourage bubble growth because they efficiently disrupt the polar attractions between water molecules, creating bubble growth sites.
Low surface tension also helps bubbles grow quickly. Measurements showed that the surface tension in water containing the sweetener aspartame is lower than in sugary water, explaining why Diet Coke creates more dramatic fountains than sugary Coke. Another factor is that the coatings of Mentos contain gum arabic, a surfactant that further reduces surface tension in the liquid. Rough-surfaced mints without the surfactant did not create such large fountains. Make sure you wear your goggles and lab coats, so that you are not only protected, you also look cool as you run away from the flying soda.
The Big Question What happens if you drink soda and then eat Mentos? Well, a lot of the fizz goes away as you drink. Then when bubbles are released in your stomach, your stomach can expand a bit. Do not, repeat, do not be stupid and test the limits of your stomach. Don't even think about it. What Else Works? Shockingly enough, dropping just about anything into just about any kind of soda creates at least a little fizz. Even some pocket change made a bottle of root beer bubble up a bit.
Does It Have to be Diet? Diet Coke and Coke Zero tend to go a bit higher than regular soda, because they have a little more carbonation and the sweeteners help make the reaction a little bigger. New Scientist has this great summary of the explanation. Fun with Nucleation You can learn more about nucleation sites in action if you coat the inside of a small glass with vegetable oil. Move the glass around to get a nice smooth coating of oil and then pour in some soda.
What happens?
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