Mento Rocket Geysers
Question: When putting Mentos into soda, does the type of soda make a difference in the physical reaction and why?
Hypothesis: The ingredients in the soda will have an effect on the reaction. We think the soda with the highest carbon dioxide gas content will go the highest.
Step 1. - place the bottle of Diet Coke, and Sprite on a flat surface
Step 2. - Open the bottle carefully to avoid fizz
Step 3. - using the tube, slide 3 mentos into the bottle
Step 4. - measure the height of the geyser
If possible we would request to be near a sink or door leading outside in order to cleanup the liquid from the soda bottles
Watch us in action:
The Science behind it:
The combination of the ingredients in the soda and the Mentos causes the geyser-like reaction. Soda is made up of mostly water but also contains sweeteners, flavoring and carbon dioxide gas. Mint Mentos have many small craters (show photos and golf balls) on the surface of the candy. Once the mints are dropped into the soda, the carbon dioxide gas is attracted to the craters and forms carbon dioxide bubbles. Since there are so many craters on the Mentos, there are lots of places for the carbon dioxide bubbles to form quickly. As the Mentos sink to the bottom of the soda bottle the bubbles form and push the soda out of the bottle. Diet Soda causes a higher geyser since it contains aspartame which lowers the surface tension and causes a bigger reaction. This process is called nucleation.
In conclusion our hypothesis was incorrect because it is not just carbon dioxide that creates the highest geyser. We determined through our research that there must be three key ingredients to create the highest geyser. The craters in the Mentos, the aspartame in diet soda, and the carbon dioxide gas must all be present to make this successful. Therefore, Diet Soda is the only soda in our experiment which contains aspartame creating the highest geyser.
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