Mentos Explosion Experiment -Make a Geyser

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Mentos Rainbow Explosion Experiment is where science and display collide in a burst of vibrant colors! In this experiment, we will explore the fascinating reaction between Mentos and soda as it transforms an ordinary beverage into a rainbow fountain that will leave you both educated and entertained.

Through hands-on exploration and observation, we will discover how the texture and composition of Mentos trigger a rapid and powerful release of carbon dioxide, resulting in an exhilarating and visually stunning display. So, grab your safety goggles, and get ready for a wild ride filled with fizzy fun. Prepare to be dazzled and inspired as STEM science experiments come alive in a kaleidoscope of colors right before your eyes!

Mentos Explosion Experiment – Mentos Geyser

mentos explosion experiment

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What ingredients are needed for the Mentos Explosion Experiment?

ingredients needed for the STEM experiment mentos explosion experiment

Note: Measurements for the dishwashing liquid, vinegar, and baking soda are approximate.


In order to analyze the results, have a video camera or smartphone with video capabilities available to capture the experiment.

supplies needed for a STEM Experiment with mentos and rainbow soda fanta

Prepare the candy by removing it from the sleeve and placing one sleeve of candy into each cup.

supplies needed for a STEM Experiment with mentos and rainbow soda fanta

Add ¼ cup baking soda to each cup with the Mentos.

make a mentos guyser

Pour equal amounts of each different Fanta into its own cup.

To each cup of Fanta, add ¼ cup of dishwashing liquid and vinegar. Also, add drops of matching food coloring.

mentos geysers soda geysers

Simultaneously, drop the candy into the Fanta.

best soda for mentos fountain

TIP: Use a level surface so the bottles don’t fall over.

mentos and soda science fair project

What causes the Coke and Mentos eruptions?

The rapid and explosive reaction between Coke and Mentos candies is caused by a combination of factors. When Mentos candies are dropped into the carbonated beverage, they provide numerous nucleation sites—tiny pits and crevices on their rough surface—where carbon dioxide gas molecules can gather and form bubbles. Additionally, Mentos candies are coated with a substance called gum arabic, which lowers the surface tension of the liquid and allows the carbon dioxide to be released more rapidly. This sudden release of carbon dioxide creates a powerful eruption, shooting the liquid and foam high into the air in an exciting and visually stunning display.

mentos and soda science fair project
soda giser

Any safety precautions to consider during the Mentos Explosion experiment?

When conducting any experiment involving the eruption of carbonated beverages, it is important to prioritize safety. Here are some safety precautions to consider:

  • Wear appropriate clothing, including safety goggles, to protect your eyes from any splashes or debris. It is also a good idea to wear old clothes that you don’t mind getting dirty.
  • Perform the experiment outdoors or in a well-ventilated area to avoid inhaling any potentially harmful fumes or releasing excessive pressure indoors.
  • Ensure that you have enough space around you to safely conduct the experiment without any obstacles or hazards nearby.
  • Place a stable and flat surface, such as a table or the ground, to perform the experiment. Make sure it’s a surface that can withstand any potential spills or stains.
  • Stand a safe distance away from the carbonated beverage bottles during the experiment to avoid any potential injury from the rapid expulsion of liquid.
  • If children are involved in the experiment, ensure that they are supervised by responsible adults who are familiar with the procedure and can provide guidance on safety.

Mentos and Soda Science Fair Project

why does mentos make soda explode

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What is the Scientific Conclusion after seeing this experiment?

The scientific conclusion after witnessing the Mentos Rainbow Explosion Experiment can be summed up in two words: explosive fun! But let’s break it down a bit more scientifically, shall we? The eruption occurs due to a remarkable phenomenon called nucleation, where tiny pits on the surface of Mentos candies provide a perfect breeding ground for carbon dioxide bubbles.

As the candies drop into the carbonated beverage, a rapid release of trapped carbon dioxide ensues, creating a thrilling eruption of fizz and foam. This experiment demonstrates the power of surface tension, the importance of texture, and a good chemical reaction. So, in scientific terms, the conclusion is clear: Mentos + carbonated beverage = an explosive and fizzy display that will leave you craving more knowledge about the wonders of chemistry.

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