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
Main hazards	Causes skin burns and eye damage.
GHS pictograms
GHS Signal word	Danger
GHS hazard statements	H301, H311, H314, H330
GHS precautionary statements	P260, P264, P270, P271, P280, P284, P301+310, P301+330+331, P302+352, P303+361+353, P304+340, P305+351+338, P310, P312, P320, P321, P322, P330, P361, P363, P403+233, 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 pK_as of 3.5 and around 8.5. The conjugate bases are the monofluorophosphates, which are hydrolytically robust.

References

Charles B. Lindahl, Tariq Mahmood (2000). "Fluorine Compounds, Inorganic, Phosphorus". Kirk‐Othmer Encyclopedia of Chemical Technology. doi:10.1002/0471238961.1608151912091404.a01. ISBN 9780471484943.CS1 maint: uses authors parameter (link)

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[KO-1] Charles B. Lindahl, Tariq Mahmood (2000). "Fluorine Compounds, Inorganic, Phosphorus". Kirk‐Othmer Encyclopedia of Chemical Technology. doi:10.1002/0471238961.1608151912091404.a01. ISBN 9780471484943.CS1 maint: uses authors parameter (link)