Mentos and Diet Coke

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Ingredients Required:

  • 1 pack of mint mentos
  • 1 2-Liter bottle of Diet Coke (This cannot be substituted)
    • Graduated cylinder (Small enough to hold mentos in a stack)

What To Do:

  1. Place 2-Liter bottle of Diet Coke on the ground and remove the cap.
  2. Hold index card over the opening of the soda.
  3. Place entire pack of mentos into graduated cylinder
  4. Place cylinder upside-down onto index card
  5. Remove index card so mentos fall in a line into the soda

*A large foamy fountain should errupt from the diet coke. This will only last for a few seconds*

  • Variation can be added to this experiment by using multiple bottles of diet coke and changing the number of mentos added each time. This allows students to make hypothesis on what they think will happen with either more or less mentos.*

Location and Appropriate Age Group:

  • This demonstration is messy and should only be done outside. It can be cleaned up easily, and is ok to do on grass or paved surfaces.
  • This demonstration is especially good for younger students (ages 5-7). For older kids, it can still be fun but it is a popular demonstration so they may have seen it before.

How It Works:

  • Diet Coke has artificial sweetener and preservatives in it. It is also carbonated. When the soda is opened, the gas is released and is able to form bubbles. When the mentos are added to the soda it causes the gaseous bubbles to form at an extremely rapid rate.
  • The mentos are heavier than the soda as well, causing them to sink to the bottom and therefore causing the entirety of the soda to essentially become a pocket of air. The shape of the 2-Liter bottle makes it so the air cannot be released easily, only allowing it to escape through the small opening in the top, which creates the fountain effect.