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Problems obtaining ferric oxide

  1. Oct 9, 2004 #1
    I am making ferric oxide (Fe2O3) for a school project. I have immersed a piece of iron in a solution of tap water and salt (to allow for electrical conductivity). The piece of iron in attached to the positive terminal of a battery charger and the negative wire is attached to a section of graphite from a pencil. When i plug in the charger, the negative wire starts bubbling and after a while, a blueish-green substance begins to form at the bottom of the container and on the piece of iron.

    What is this substance bluish-green? How do i correct my procedure to obtain rust?
  2. jcsd
  3. Oct 9, 2004 #2


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    What color is FeO? This is a pure guess on my part, but could you be making that?
  4. Oct 9, 2004 #3
    My guess is that it's an oxide of copper. The wire you're using is most-likely an alloy of it, and it is participating in the reaction.
  5. Oct 9, 2004 #4


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  6. Oct 17, 2004 #5


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    Hello, the bluish-green substance is more likely to be a copper compound rather than iron. The how and why of it is uncertain for now, it may involve electrochemical oxidation order.
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