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Thread: Why KMnO4 is called permanganate?

  1. #1 Why KMnO4 is called permanganate? 
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    Hi, why is KMnO4 called permanganate and HClO4 called perchloric acid, though they are not having any PEROXY linkage????????


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  3. #2  
    Forum Professor pyoko's Avatar
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    Because one is an MnO4 ion (perMANGANATE) and the other is a ClO4 ion (perCHLORATE). Replace the Mn with Cl in the name and it all makes perfect sense.

    https://en.wikipedia.org/wiki/Perchlorate

    https://en.wikipedia.org/wiki/Permanganate


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  4. #3  
    Bullshit Intolerant PhDemon's Avatar
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    Just to add the per- part has nothing to do with peroxide (which is just one example), it is a prefix used to denote a polyatomic anion containing oxygen has the maximum proportion of oxygen in it. See the oxyanion section here IUPAC nomenclature of inorganic chemistry - Wikipedia, the free encyclopedia
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  5. #4  
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    Quote Originally Posted by PhDemon View Post
    Just to add the per- part has nothing to do with peroxide (which is just one example), it is a prefix used to denote a polyatomic anion containing oxygen has the maximum proportion of oxygen in it. See the oxyanion section here IUPAC nomenclature of inorganic chemistry - Wikipedia, the free encyclopedia
    Indeed.

    You can see here the more general meaning of the prefix "per-", which helps to put this into the context of other words that use it:- Per- | Define Per- at Dictionary.com
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  6. #5  
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    ok thanks a lot
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  7. #6  
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    per- or peroxy
    [L < per, through]
    prefix
    1. through, throughout [perfoliate, peroral]
    2. thoroughly, completely, very [perfervid]
    3. Chem.
    a) containing a specified element or radical in its maximum, or a relatively high, valence [perchloric acid]
    b) containing the maximum amount of the indicated element [perfluoropropane (completely fluorinated propane, C3F8)]
    c) containing the divalent group O2 [peracid]: sometimes peroxy-
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