Coord. Compound Homework: Mercury (II), Sulfate, Potassium, Ba(NO3)2

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In summary, the conversation discusses the formation of a coordination compound containing mercury (II), sulfate ion, and potassium ion. When barium nitrate is added to the water solution of this compound, no precipitate is formed. The compound has a coordination number of 4 and a water solution of the compound shows an electrical conductivity equal to 7 ions per formula unit. The formula of the compound is most likely K6[Ag(SO3)4], although there are doubts about its feasibility. Anions can also act as ligands, with some common examples being Cl- and CN-. However, the sulfate ion is not a particularly efficient ligand. Mercury sulfite complexes are much more stable.
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Homework Statement


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?


Homework Equations



N/A

The Attempt at a Solution



[Hg(SO4)4]K2

not sure ?
 
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  • #2
The sulfate ion isn't a ligand.
 
  • #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.
 
  • #4
ya it must be SO3

But what about the name of the compound? I must be way off?
 
  • #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
 
  • #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.
 
  • #7
kldickson said:
Also, if I am correct, anions typically aren't ligands.
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-.
 
  • #8
Fightfish, you're right about the anions.
 
  • #9
kldickson said:
The sulfate ion isn't a ligand.

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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Related to Coord. Compound Homework: Mercury (II), Sulfate, Potassium, Ba(NO3)2

1. What is the chemical formula for Mercury (II) sulfate?

The chemical formula for Mercury (II) sulfate is HgSO4.

2. What is the molar mass of Potassium sulfate?

The molar mass of Potassium sulfate is 174.26 g/mol.

3. How many moles of Ba(NO3)2 are present in 50 grams?

To calculate the number of moles, we first need to know the molar mass of Ba(NO3)2, which is 261.34 g/mol. Then, we divide the given mass (50 grams) by the molar mass to get the number of moles, which is 0.191 moles.

4. What is the name of the coordination compound HgSO4?

The name of the coordination compound HgSO4 is Mercury (II) sulfate.

5. How does the coordination compound Ba(NO3)2 behave in water?

Ba(NO3)2 is a water-soluble compound, meaning it will dissolve in water to form a solution. In this solution, the Ba(NO3)2 will dissociate into its ions, Ba2+ and 2NO3-.

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