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Topic: reaction between Fe3+ and (PO4)3-?  (Read 24658 times)

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Offline foollo

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reaction between Fe3+ and (PO4)3-?
« on: November 12, 2006, 01:46:30 PM »
What is the reaction between Fe3+ and (PO4)3-?
Would it be precipitation or ccomplex formation?

Offline Alberto_Kravina

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Re: reaction between Fe3+ and (PO4)3-?
« Reply #1 on: November 12, 2006, 01:54:55 PM »
Precipitation reaction.

Offline woelen

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Re: reaction between Fe3+ and (PO4)3-?
« Reply #2 on: November 12, 2006, 04:26:01 PM »
Fe(3+) and PO4(3-) form a white precipitate. It in fact also is a complex formation, the resulting compound can best be regarded as the ferric salt of a phosphato ferrate (III) complex. The formation of this complex can be nicely demonstrated by adding dilute acidified phosphate or dilute H3PO4 to a ferric salt. The liquid becomes totally colorless, which is quite surprising for an iron (III) complex. There is yet another such colorless iron (III) complex and that is FeF6(3-).
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Offline Borek

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Re: reaction between Fe3+ and (PO4)3-?
« Reply #3 on: November 12, 2006, 05:35:07 PM »
Quite a lot depends on pH here.
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Offline bryanh

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Re: reaction between Fe3+ and (PO4)3-?
« Reply #4 on: November 15, 2006, 08:40:00 AM »
Hi, I am interested in this too, would appreciate answers to any of the following.
How does Fe2+ react with phosphate?
What about Cu and Zn ions are they similar?
What is the effect, mentioned above, of pH esp. in the range 6-8?
Does the reaction require the Fe3+ to be aqueous? Fe3+ readily preciptates to hydroxides can these hydroxides react in the same way?

Offline Borek

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Re: reaction between Fe3+ and (PO4)3-?
« Reply #5 on: November 15, 2006, 10:01:54 AM »
Look for Kso tables in any decent analytical chemistry textbook or handbook. These are rather complicated equilibria involving many substances so it is hard to tell what and how will react.

Below see list of species present in the solution made of 0.1M Fe3+ and 0.05M PO43- ((s) stands for solids, numbers to the right are concentrations or for solids - amount of solid per L of solution). These are not necesarilly all species present, only those for which program I am working on already has equilibrium constants in database.
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