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How To Make a Mentos & Diet Soda Chemical Volcano Eruption

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The mentos & diet cola fountain is easy and fun.

This is an easy project. You'll get all wet, but as long as you use diet cola you won't get sticky. Just drop a roll of mentos all at once into a 2-liter bottle of diet cola.

Anne Helmenstine

Chemical volcanos are classic projects for science fairs and chemistry demonstrations. The mentos and diet soda volcano is similar to the baking soda volcano, except the eruption is really powerful, capable of producing jets of soda several feet high. It's messy, so you might want to do this project outdoors or in a bathroom. It's also non-toxic, so kids can do this project.

Difficulty: Easy

Time Required: chemical volcano takes a few minutes to set up and erupts for a few seconds

Here's How:

  1. First, gather your supplies. You can substitute another candy for the Mentos, such as M&Ms or Skittles, but ideally you want candies that stack into a neat column with minimal space between them, have a chalky consistency, and barely fit through the mouth of a 2-liter bottle.
  2. Similarly, you could substitute normal soda for diet soda. The project will work just as well, but the resulting eruption will be sticky. Whatever you use, the beverage has to be carbonated!
  3. First, you need to stack the candies. The easiest way to do this is to stack them in a test tube narrow enough to form a single column. Otherwise, you can roll a sheet of paper into a tube just barely wide enough for a stack of candies.
  4. Place an index card over the opening of the test tube or end of the paper tube to hold the candies in the container. Invert the test tube.
  5. Open your full 2-liter bottle of diet soda. The eruption happens very quickly, so set things up: you want the open bottle - index card - roll of candies so that as soon as you remove the index card, the candies will drop smoothly into the bottle.
  6. When you're ready, do it! You can repeat the eruption with the same bottle and another stack of candies. Have fun!

What You Need:

  • roll of mentos candies
  • 2-liter bottle of diet soda
  • index card
  • test tube or sheet of paper
  • a mop for cleanup
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