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Thread: Diet Coke and Mentos? What is the science behind it?

  1. #1 Diet Coke and Mentos? What is the science behind it? 
    Forum Junior newnothing's Avatar
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    Does this really work? Diet Coke and Mentos creating a soda fountain?
    >>http://www.youtube.com/watch?v=B8qfh...eature=related

    What is the science behind it?


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  3. #2  
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    Yeah it does... but a more exciting one is aluminum foil and Works (c) toilet bowl cleaner in a water bottle (be sure to put the cap on, and get atleast 10ish feet away)

    Idk why it works, but it does


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  4. #3  
    Reptile Dysfunction drowsy turtle's Avatar
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    Quote Originally Posted by okkaoboy
    Yeah it does... but a more exciting one is aluminum foil and Works (c) toilet bowl cleaner in a water bottle (be sure to put the cap on, and get atleast 10ish feet away)

    Idk why it works, but it does
    Aluminium is actually quite reactive. Aluminium powder that is used for revealing fingerprints is extremely flamable. We don't normally see it, because it forms an unreactive layer of aluminium oxide.
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  6. #5  
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    Yeah I know, but I dont know what part of the Works (c) reacts with the aluminum...some acid probably
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    Aluminium metal dissolves readily in dilute hydrochloric acid to form solutions containing the aquated Al(III) ion together with hydrogen gas, H2.
    2Al(s) + 6HCl(aq) → 2Al3+(aq) + 6Cl-(aq) + 3H2(g)

    The last bit is the clue, 3 lots of H2 (gas) hydrogen

    aluminium (tin foil) + hydrochloric acid CHANGES TO: aquated aluminium + chlorine + hydrogen gas

    It would need ignition however as I don't think it would spontaneously ignite, the pressure maybe would pop the bottle (they are tested way above the 2BAR required to hold fizzy drink though!)


    It's Logic Jim But Not As We Know It...
    My thought is the whole reaction is exothermic, and the heat ignites the hydrogen.
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    It doesn't really ignite though, its just alot of pressure being released rapidly...wouldn't it need carbon to combust anyway?
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  9. #8  
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    Quote Originally Posted by okkaoboy
    It doesn't really ignite though, its just alot of pressure being released rapidly...wouldn't it need carbon to combust anyway?
    No.

    2H2 + O2 -> 2H2O

    2Mg + O2 -> MgO
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  10. #9  
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    I know that, all Im saying is that I thought you meant cobumbustion by ignition, and as a person that has done this before I know it doesn't do that. Once they come in contact they start to react and produce hydrogen gas and its just the huge amounts of gas that causes it to pop. (the bottle actually stretches).

    I guess I misunderstood since I thought you meant combustion whern you said ignition
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