NextPrevious

The World Around Us

Chemicals in Food

Why do diet Coke® and Mentos® fizz like that?

In diet Coke®, and all soda, there are a lot of CO2 molecules trapped in solution. The slow release of CO2 from solution is what normally makes the calm bubbling in soda. But what if you were to put a catalyst for gas release into a bottle of diet Coke®? That’s exactly what a Mentos® does. Dissolved gases need a surface to start forming a bubble (let’s just assume that’s true, which it is), and the Mentos® candy provides a huge amount of surface area because it is a very porous material. So add a Mentos® and many, many more CO2 bubbles can form at the same time, which leads to a sugary eruption.



Close

This is a web preview of the "The Handy Chemistry Answer Book" app. Many features only work on your mobile device. If you like what you see, we hope you will consider buying. Get the App