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[Chem] Net ionic equations

  1. Mar 26, 2009 #1
    1. The problem statement, all variables and given/known data
    I need to find net ionic equations for:
    -Fe(NO3)3 + NH3
    -Cr(NO3)3 + NH3
    -Cu(NO3)2 + NH3
    -AgNO3 + NH3
    -Cr(OH)3 + NaOH
    -Fe(OH)3 +NaOH
    and a whole bunch of other reactions.
    I have no problem with writing the balanced equations but I get a little stuck on breaking things up into ions.

    3. The attempt at a solution
    So the first one would be:
    Fe(NO3)3(aq) + 3NH3(aq) + 3H2O(l) --> Fe(OH)3(s) + 3NH4NO3(aq)
    from there would it be:'
    Fe(3+) + 3NO3(-) + 3NH2(-) + 3H(+) --> Fe(OH)3 + 3NH4(+) + 3NO3(-)?
    I don't think this is correct because I think I need to end up with:
    Fe(NO3)3(aq) + 3NH3(aq) --> Fe(OH)3(s)
    but I'm not sure how to go about breaking things up so that the spectator ions cancel correctly. Any hints?
     
  2. jcsd
  3. Mar 26, 2009 #2

    Borek

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    Staff: Mentor

    Start dissociating all salts.

    Ammonia reacts with water producing NH4+ and OH-, but that's not necesarilly the most important reaction in some of the cases listed.
     
  4. Apr 1, 2009 #3
    Ok, so let me make sure I'm getting these right...

    -Fe(+3) + 3OH(-) --> Cr(OH)3
    -Cr(+3) + 3OH(-) --> Fe(OH)3
    -Cu(+3) + 2NH3 --> Cu(NH3)2(+3)
    -Ag(+) + 6NH3 --> Ag(NH3)6(+)

    am I on the right track with those?
     
  5. Apr 2, 2009 #4

    Borek

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    Staff: Mentor

    Please recheck these equations. Charges are wrong, you are not listing states and you are transmuting metals.
     
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