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Thread: Soap and shampoo

  1. #1 Soap and shampoo 
    Forum Freshman +SCIENCEgirl+'s Avatar
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    I've got a question (it is bothering me for a whole time.. )
    When you take a bath, you put soap in it (the foam appears..) I know that that is because there is not enough space for all the soap to be at the surface of the water, so they make together a micel ( it's how we call it in dutch) (http://www.kiriya-chem.co.jp/q&a/image/micel.gif)
    the part of the soap which is "afraid of water" (hydrofoob?) come together and thats when they make an airbubble.
    But then, when you put shampoo in you hair and it gets into the water all she bubbles disappear?!
    how come?
    I thought that that is soap too so there will be more and more bubbles but that's not how it works apparently.. can someone explain this to me?


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  3. #2 Re: Soap and shampoo 
    Moderator Moderator AlexP's Avatar
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    Quote Originally Posted by +SCIENCEgirl+
    "afraid of water" (hydrofoob?)
    can't really answer your question, sorry, but the word you're looking for there is hydrophobic. the hydrophobic portion of a soap molecule would be the nonpolar end...


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  4. #3  
    Forum Freshman Dantak's Avatar
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    Soap is a surfactant, this means that it has a hydrophobic and a hydrophillic portion. This is called amphiphillic. This is why it makes organics, such as cooking grease dissolve in water. The hydrophobic portions turn toward the inside and the hydrophillic portions on the outside. They form tiny miscelles.
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  5. #4  
    Forum Freshman +SCIENCEgirl+'s Avatar
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    but why does the soap dissapear, then?
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  6. #5  
    Forum Freshman Dantak's Avatar
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    It doesn't really disappear. It dissolves to a certain extent. For instance if you put soap in the ocean and aggitated it, you would not fill the ocean with bubbles. The reason bubbles remain in your bath is that they are confined to certain amount of water. Rinsing shampoo out of you hair amounts to opening the drain in the tub and running the water, eventually the bubbles will go away. The following is a good website on how soap works.

    http://www.elmhurst.edu/~chm/vchembook/554soap.html
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  7. #6  
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    I also think that shampoo when in your hair is very very very small bubble so it doesnt look like the bubbles soap normally makes.

    Also if u put a peice of soup in water and leave it without agitation no bubbles will form but the soup will dissappear because it disolves
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