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Chemical Nomenclature

  1. Jun 4, 2014 #1
    1. The problem statement, all variables and given/known data
    Write the formula of : lead(2) permanganate


    2. Relevant equations



    3. The attempt at a solution
    So I know that this formula is the combination of lead magnesium and oxygen. I know that the -ate suffix means that it has the most number of oxygen ions possible. The answer was Pb (MnO4)2. I don't know what
    1- the prefix per- means
    2 - how to find the number of Oxygen molecules
    3- how to find the magnesium oxyanion
    4- how to find the charge of a substance based on its location on the periodic table
    thanks in advance!
     
  2. jcsd
  3. Jun 4, 2014 #2

    Borek

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    Staff: Mentor

    No way to answer your questions without knowing what manganate is. Lead(II) permanganate is not a systematic name, half-systematic name at best.

    per- means acid with the highest oxidation state of the central atom (or the highest number of oxygen atoms combined with the central atom).

    Naming of many substances is half-systematic, half-conventional. Unfortunately, that means many of these names are best remembered.
     
  4. Jun 4, 2014 #3
    OK thanks! I didn't notice that the problem gave the formula for manganese. I figured it out.
     
  5. Jun 4, 2014 #4

    Borek

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    Staff: Mentor

    Manganese? Or manganate?
     
  6. Jun 5, 2014 #5
    Sorry I meant manganate.
     
  7. Jun 5, 2014 #6

    Borek

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    Staff: Mentor

    OK, that makes the problem easier.

    Still, sometimes difference between acid and peracid is number of oxygens (ClO3- vs ClO4-), sometimes it is charge of the oxyanion (MnO42- vs MnO4-).
     
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