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Destroyer GC 140

Discussion in 'DAT Discussions' started by Dusk, Aug 15, 2011.

  1. Dusk

    Dusk Member
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    Destroyer GC 140 in 2011 version, 132 in 2010 version.

    I have a minor/stupid question on this problem:

    "Consider hydrozoic acid, HN3. The Ka at 25 C is 2x10^-5. Which of these statements will be true if HN3 was put into solution?"

    So the answer says that [N3-]=[H+] at eqlbm based off of the balanced reaction HN3(aq) +H2O(l) --> H3O+(aq) + N3- (aq).

    Okay, I understand that, but based off of other solubility problems like finding the Ksp of BiI3(s) --> Bi + 3I- , why is is that the balanced reaction isn't written as:

    HN3 --> H+ + 3N ? And so it would be [H+]=3[N-] at eqlbm?


    Is it just cause N3 is a compound and it can't be broken up into 3N? But BiI3 was broken into 3I, not I3..... :banana:
     
  2. needzmoar

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    Right, hydrozoic acid dissociates to [H+] and [N3-]. If anything, the azide ion decomposes to molecular nitrogen, but that's not what the question is asking for.
     
  3. OP
    OP
    Dusk

    Dusk Member
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    awesome, thanks!
     

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