How to Make A Geyser with Diet Coke and Mentos Candy

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By Sum Dum Guy
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A homemade geyser

Here's a fun way to teach your kids about chemical reactions, the power of pressure and geysers all in one fun experiment. All you need are a few items that your can find in most stores or online. Your kids will think it is the coolest thing ever.

(See link below for a video of a Geyser Tube in action!)

Difficulty: Moderately Easy

Instructions

Things You'll Need:

2 Liter bottle of Diet Coke
A package of Mentos mint candy
A Geyser Tube (optional, but far more entertaining)

Step 1

Find an open outdoor area (preferably one that can be sprayed with diet cola and not cause any problems) and set up your Diet Coke 2 liter bottle. You may want to stabilize it using a terra cotta flower pot, cinder block or some other sturdy base that will prevent it from tipping over while the bottle's contents are shooting skyward.
Step 2

Attach your Geyser Tube (see link below) to the opened 2 liter bottle per the instructions included with the GeyserTube.
Step 3

Load the Geyser Tube with the Mentos candy. Make sure the pin has been inserted into the shaft of the tube first, or else you're gonna get wet!
Step 4

When all observers are ready, pull the pin from the Geyser Tube to drop the Mentos candy into the soda.
Step 5

Within a second or two, a chemical reaction will occur causing the soda to shoot out from the bottle and spray many feet into the air! Repeat as often as you wish. Enjoy!

(See link below for a video of the Geyser Tube in action!)