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4B70.25 - Diet Coke and Mentos (Indoors)

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​4B70.25 - Diet Coke and Mentos (Indoors)

Title4B70.25 - Diet Coke and Mentos (Indoors)

​To demonstrate how nucleation sites on the Mentos serve as a catalyst for the release of CO2 from the Diet Coke with the presents of potassium benzoate, aspartame, gelatin, and gum arabic causing a rapid formation of foam.

Assembly Instructions

​Place the nerf football in the top of the clear pvc tube that is hung from the hoist.  Connect the second part of the tube and raise it up so that it just covers the Diet Coke bottle when it is placed in the stabilizing cone.  Load 5-7 mentos into the mentos release mechanism.  Place the caution cone and diet coke in the large aluminum pan.  Screw off the top of the soda and screw on the mentos release mechanism.  When ready, tell the professor to pull out the stopper and stand back.

Setup Time10
Operation Time5
Preview Time5
Operation Instructions

With the release mechanism screwed onto the Diet Coke bottle and placed under the clear pvc tube, give a count down, pull out the pin and stand back.  Observe the foam geyser that is produced by the reaction between the ​potassium benzoate, aspartame, and CO2 of the Diet Coke with the gelatin, gum arabic, and amount of nucleation sites that are present in the mint Mentos candies.

Demo on DimeNo
PIRA 200No
Export Instructions (if different)
Consists of only a Diet Coke bottle and the mentos release mechanism.  Meant for OUT DOOR USE ONLY.

Resource: "Soda Pop Fizz-ics" by Tonya Coffey, The Physics Teacher, Vol. 46, No. 8, pp. 473–476, November 2008
Resource: Myth Busters

Category4 Thermodynamics
Subcategory4B - Heat and the First Law
Keywordsmentos, diet coke, nucleation,
Construction Information
hoist key
cylindrical containment tube with coupler - clear, two part
caution cone - cut off to fit 2L bottle
diet coke - 2L bottle
mentos release mechanism
pan - aluminum, 36" by 24"
nerf football