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Iodine starch and water

  1. Oct 17, 2012 #1
    I've been teaching my daughter about the elements and am demonstrating the iodine+water+starch="clock" reaction. In an effort to provide accurate and straightforward information I am wondering that since starch is essentially carbon if pure carbon can be substituted for starch or if the starch has some property essential to the outcome of the experiment?

    - Thanks
     
  2. jcsd
  3. Oct 17, 2012 #2

    Borek

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    Staff: Mentor

  4. Oct 23, 2012 #3
    Thanks for the response. We used pure starch and were successful. We learned the carbohydrates in starch were made up of carbon hydrogen and oxygen. My original idea was that since the experiment included water anyways that the hydrogen and oxygen components of the starch carbohydrate wouldn't necessarily be essential. Although I never tested this hypothesis I have doubts it would work.
     
  5. Oct 23, 2012 #4

    Borek

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    Staff: Mentor

    They are essential. There is a huge difference between a compound that contains carbon, hydrogen and oxygen, and mixture containing all three elements.

    Most (but not all) carbohydrates have formula Cm(H2O)n - that is, they look like made of carbon and water, But it doesn't mean they are made this way, it is just a side effect of the valencies of atoms involved.
     
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