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Homework Help: Coord. compound

  1. Aug 6, 2009 #1
    1. The problem statement, all variables and given/known data
    A coord. compound of mercury (II) is found to contain the sulfate ion and the potassium ion as well as Hg+2. Ba(NO3)2 solution is added to a water solution of this compound, but there is no precipitate. If the coord. # is 4, and a H20 solution of the compound shows an electrical conductivity equal to 7 ions per formula unit, what is the formula?

    2. Relevant equations


    3. The attempt at a solution


    not sure ???
  2. jcsd
  3. Aug 8, 2009 #2
    The sulfate ion isn't a ligand.
  4. Aug 9, 2009 #3
    Are you sure its a sulfate and not a sulfite ion? Cos' like kldickson mentioned, the sulfate ion isn't a ligand, yet there are no free sulfate ions since no ppt is formed with barium nitrate. Also, the species that you mentioned there is not a compound - it has a net negative charge.
  5. Aug 9, 2009 #4
    ya it must be SO3

    But what about the name of the compound? I must be way off???
  6. Aug 10, 2009 #5
    Then its probably K6 [Ag(SO3)4], though i have doubts about the feasibility of its formation. Not sure about the nomenclature of sulfite ligands and the "anionic complex-ed" mercury
  7. Aug 10, 2009 #6
    Set up a reaction between the barium nitrate and the mercury-potassium-sulfate solution.

    Also, if I am correct, anions typically aren't ligands.
  8. Aug 11, 2009 #7
    Not true, anions are in fact rather common ligands since they are stronger ligands than water. For instance, some common ligands are Cl- and CN-.
  9. Aug 11, 2009 #8
    Fightfish, you're right about the anions.
  10. Aug 11, 2009 #9


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    Staff: Mentor

    Not particullarly efficient at complexing, nonetheless some of its complexes have overall stability constants in the 104 range.

    Mercury SO32- complexes are much much more stable.

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