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Oxidation numbers.

  1. Dec 3, 2009 #1

    ipl

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    Determine the oxidation numbers of the underlined elements in the following formulas:?
    If you could explain each one, it would be greatly appreciated. Thanks!
    a) KClO3
    b) NH4+
    c) Cr2O72-
    d) MnO42-
     
  2. jcsd
  3. Dec 3, 2009 #2

    Borek

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    Staff: Mentor

  4. Dec 3, 2009 #3

    ipl

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    Okay is a) +5 because K=+1 and O=-2? I'm just wondering cause someone posted that on yahoo.
     
  5. Dec 3, 2009 #4

    Borek

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    Staff: Mentor

    Yep, Cl in KClO3 is +5 (regardless of what was posted on Yahoo).

    --
     
  6. Dec 3, 2009 #5

    ipl

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    do you think you could explain to me why?
     
  7. Dec 3, 2009 #6

    Borek

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    Staff: Mentor

    Because it can be calculated following rules from the page I have linked to?

    Nothing magic about it. Molecule is neutral, K is +1 (one of the rules), O is -2 (one of the rules), so Cl+1+3*(-2)=0.

    --
    methods
     
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