September 15, 2019, 06:11:08 AM
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Topic: Balancing chemical equation FeCl3 + P = FeCl3(PO4)2  (Read 310 times)

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Offline Wurstie

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Balancing chemical equation FeCl3 + P = FeCl3(PO4)2
« on: June 12, 2019, 03:37:12 PM »
I'm from Denmark and preparing for my exam in Chemistry, now I have about water cleaning. In water cleaning plants, you put FeCl3 into water with NPK- fertilizer to remove the phosphor. When this happens an ionic bond is created between the FeCl3 and the P, I don't know the chemical formula for this. But looking around I found Fe3(PO4)2, I just don't know you would get that from FeCl3 and phosphor. Can anybody help me? Sorry if my English terms aren't correct

Offline AWK

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Re: Balancing chemical equation FeCl3 + P = FeCl3(PO4)2
« Reply #1 on: June 12, 2019, 03:53:43 PM »
Simply FePO4
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Offline Wurstie

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Re: Balancing chemical equation FeCl3 + P = FeCl3(PO4)2
« Reply #2 on: June 12, 2019, 03:56:48 PM »
Simply FePO4
Oh sorry, but how would you go about it. Showing how P becomes PO4-3 and then I would assume FeCl3 becomes Fe3+ and 3Cl-, but how does P become PO4-3?

Offline AWK

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Re: Balancing chemical equation FeCl3 + P = FeCl3(PO4)2
« Reply #3 on: June 12, 2019, 04:07:20 PM »
P in NPK means calculated P2O5 content. But this means derivatives of phosphoric acid H3PO4.
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Offline David Tan

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Re: Balancing chemical equation FeCl3 + P = FeCl3(PO4)2
« Reply #4 on: June 14, 2019, 04:21:39 PM »
Ferric chloride or sulphate and ferrous sulphate are all widely used for
phosphorous removal, although the actual reactions are not fully
understood. The basic reaction is:
Fe3+ + HnPO43-n ↔ FePO4 + nH+
Ferric ions combine to form ferric phosphate. They react slowly with the
natural alkalinity and so a coagulant aid, such as lime, if added, would
raise the pH and enhance the coagulation.
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