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Hydride vs Dihydride

  1. Jun 23, 2010 #1
    Hey all. I'm pretty sure I'd be correct in saying that the compund CaH2 is calcium hydride. My question is this... Why would it not be calcium dihydride? There are 2 hydrogen atoms right? Or are both term correct? Thanks.
     
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  3. Jun 23, 2010 #2

    Borek

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    Staff: Mentor

    Nothing wrong with "dihydride". I am not sure, but could be this is even IUPAC recommended name. Check here:

    http://www.iupac.org/publications/books/rbook/Red_Book_2005.pdf [Broken]

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    Last edited by a moderator: May 4, 2017
  4. Jun 23, 2010 #3

    Ygggdrasil

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    Generally for ionic substances (usually substances formed between a metal and non-metal), you don't need to use the mono-, di-, tri- etc. prefixes to specify number. This is because most ions have a specific charge (or for transition metals, the charge is specified), so one can figure out the correct proportion of cations and anions.
     
  5. Jun 23, 2010 #4
    So technically... Calcium hydride or calcium dihydride would both be correct?
     
  6. Jun 24, 2010 #5

    Borek

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    Staff: Mentor

    Yes.

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