Because Mentos are heavy and sink to the bottom of the bottle, the gas released by the Mentos pushes the soda up and out of the bottle in an incredible and amazing blast. As soon as the Mentos hit the soda, bubbles cling to the surfaces of the candies and then quickly rise to the surface of the liquid. These tiny pits act as nucleation sites, which are perfect for carbon dioxide bubbles. Each mint has thousands of tiny pits all over its surface. There are two reasons Mentos work so well for this experiment. The places where the bubbles form are the nucleation sites. This bubbling process is called nucleation. Adding salt to soda also causes it to foam because thousands of little bubbles form on the surface of each grain of salt. Notice how bubbles immediately form on the surface of the object. Is there another way for the carbon dioxide to escape? Try dropping an object, like a raisin or a piece of uncooked pasta, into a glass of soda. When you open the container, the bubbles quickly rise to the top, pushing the liquid out of the way, so liquid sprays everywhere. If you shake a bottle or can of soda, some of the gas comes out of the solution and the bubbles cling to the inside walls of the container thanks to the tiny pits and imperfections on the inner surface of the bottle called nucleation sites. The thing that makes soda bubbly is invisible carbon dioxide, which is pumped into bottles at the factory using lots and lots of pressure. Soda is made of sugar or artificial sweetener, flavoring, water and preservatives. Why do Mentos turn ordinary bottles of diet soda into geysers of fun? The answer is a little more complicated than you might think. The enthusiasm for dropping mints into soda bottles continues to grow today. Fueled by hundreds of blogs and popular online sharing sites like YouTube, this once obscure reaction quickly became a sensational hands-on learning activity for young scientists.
While science teachers have been dropping candies and mints into 2-liter bottles of soda for years in an effort to release all of the dissolved carbon dioxide, the Mentos and Diet Coke reaction became world-famous in 2005. Why does the reaction happen? What is it with this experiment with soda and Mentos that causes this explosion to shoot so far into the air? Beware of the 20-foot stream of soda that will erupt when you pull off this experiment. This hands-on experiment is easy to do and simply involves dropping Mentos into a bottle of diet soda and running away.
You’ve probably heard that you shouldn’t eat Mentos while you drink Coke, but why is that? What exactly happens when you mix Mentos and Coke? Follow our step-by-step instructions in our Mentos Geyser Experiment to find out.
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