Fluorophosphoric acid

Fluorophosphoric acid
Names
	IUPAC name Fluorophosphonic acid
Identifiers
CAS Number	13537-32-1;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:30210;
ChemSpider	22687;
ECHA InfoCard	100.202.790
EC Number	233-433-0;
Gmelin Reference	100863
PubChem CID	24267;
UNII	IW87A7KU3R;
CompTox Dashboard (EPA)	DTXSID1075309 ;
	InChI InChI=1S/FH2O3P/c1-5(2,3)4/h(H2,2,3,4) Key: DWYMPOCYEZONEA-UHFFFAOYSA-N;
	SMILES OP(=O)(O)F;
Properties
Chemical formula	FH2O3P
Molar mass	99.985 g/mol
Appearance	colorless liquid
Density	1.818 g/cm3
Solubility in water	yes
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Causes skin burns and eye damage.
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H311, H314, H330
Precautionary statements	P260, P264, P270, P271, P280, P284, P301+P310, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P310, P312, P320, P321, P322, P330, P361, P363, P403+P233, P405, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Fluorophosphoric acid is the inorganic compound with the formula H₂PO₃F. It is a colorless viscous liquid that solidified to a glass upon cooling.^[1]

Fluorophosphoric acid is produced by treating phosphorus pentoxide with hydrogen fluoride. It can also be prepared by hydrolysis of phosphorus oxyfluoride.^[1] The reaction first produces difluorophosphoric acid:

POF₃ + H₂O → HPO₂F₂ + HF

The next steps give monofluorophosphoric acid:

HPO₂F₂ + H₂O → H₂PO₃F + HF

Complete hydrolysis gives phosphoric acid:

H₂PO₃F + H₂O → H₃PO₄ + HF

Reactions

Fluorophosphoric acid is a dibasic acid, with pKa's of 3.5 and around 8.5. The conjugate bases are the monofluorophosphates, which are hydrolytically robust.

References

^ ^a ^b "Fluorine Compounds, Inorganic, Phosphorus". Kirk‐Othmer Encyclopedia of Chemical Technology. 2000. doi:10.1002/0471238961.1608151912091404.a01. {{cite encyclopedia}}: Cite uses deprecated parameter |authors= (help)

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[KO-1] "Fluorine Compounds, Inorganic, Phosphorus". Kirk‐Othmer Encyclopedia of Chemical Technology. 2000. doi:10.1002/0471238961.1608151912091404.a01. {{cite encyclopedia}}: Cite uses deprecated parameter |authors= (help)

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