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Thread: A soild that foams when wet?

  1. #1 A soild that foams when wet? 
    Forum Freshman
    Join Date
    Aug 2010
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    6
    Hello. Newbie here

    I have a little project on the go. Im after something ideally a solid like a washing machine capsule that when wet would foam up.

    But not one that would dry like a cavity wall insulation.

    Sort of like a hair mousse.

    I know there are sprays that reacts with air. But im wanting something that can be dropped into water then it'll foam up on top of the water.


    If not, What about mixing 2 types of powder together with water to make a foam.
    however, When i say mixing. What i really mean is when water is added.
    i.e no mixing with a spoon.

    I can't seem to find anything around. So im guessing it would have to be made. but how?

    Thanks


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  3. #2  
    Forum Bachelors Degree
    Join Date
    Jul 2008
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    420
    Dear Apriliaside,

    I hope you don't mind my asking, but what do you need it for? It will probably be easier to find something suitable if we know its intended purpose.

    In terms of things that react with water - the alkali metals e.g. Li, Na, K all react when dropped into water, to produce an aqueous alkaline hydroxide and Hydrogen gas. Reactivity increases as you descend Group 1. Whilst this won't be suitable for eliciting a benign foaming activity, it may provide a potential ingredient.

    2K(s) + 2H2O(l) -> 2KOH(aq) + H2(g)



    Other things - 'fizzy bath bombs' typically fizz and form a kind of froth once placed into water. The primary ingredients are citric acid, cornstarch and baking soda; directions for making them can be found here

    http://chemistry.about.com/cs/howtos...zybathbomb.htm

    Perhaps you could modify these?



    Best wishes,

    Tri


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  4. #3  
    Forum Freshman
    Join Date
    Aug 2010
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    Hi Tri Thanks for your reply

    It's just a little project helping out someone else.


    Alkali metals do have what im after. but they're abit to harmful for what i need.



    However, bath ball things i never thought of.
    I think this is going to be the one to play around with.

    Thanks
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  5. #4  
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    Apr 2007
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    Pennsylvania
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    I know you asked about something dropped in water, but maybe the mentos in coke reaction would work for you.
    http://en.wikipedia.org/wiki/Diet_Co...entos_eruption
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