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Homework Help: [Chem] Ions' States of Matter when not in solution

  1. Oct 13, 2007 #1


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    1. The problem statement, all variables and given/known data

    Hydrogen peroxide decomposes into water and oxygen gas with the help of a catalyst. write the molecular formula and the redox half reactions.

    2. Relevant equations


    3. The attempt at a solution

    the molec. formula is of course

    [tex]2 H_{2}O_{2} (l) \stackrel{catalyst}{\rightarrow} 2 H_{2}O (l) + O_{2} (g) [/tex]

    now for the reduction and oxidation half reactions:

    [tex] O^{2-}_{2} + 2 e^{-} \rightarrow 2 O^{2-}[/tex]

    [tex] O^{2-}_{2} \rightarrow O_{2} (g) + 2 e^{-} [/tex]

    My question is, what states should each of these ions in the half reactions be in? Normally (like for double displacement rxns) I know the ions are aqueous, but that's when both reactants are aqueous/in solution. Should the peroxide ion here, for instance, be liquid (because hydrogen peroxide is a liquid) or should it be aqueous?

    Thanks in advance! :smile:
  2. jcsd
  3. Oct 14, 2007 #2
    If i understand you question correctly then the peroxide would be aqueous because hydrogen peroxide is a very blue liquid if I'am remembering right but peroxide is an aqueous solution of hydrogen peroxide. I'm pretty sure that what I said is correct but look it up in a textbook to be safe.
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