Fluorophosphoric acid

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
Names
IUPAC name
Fluorophosphonic acid
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.202.790
EC Number
  • 233-433-0
100863
UNII
Properties
FH2O3P
Molar mass 99.985 g/mol
Appearance colorless liquid
Density 1.818 g/cm3
yes
Hazards
Main hazards Causes skin burns and eye damage.
GHS pictograms
GHS Signal word Danger
H301, H311, H314, H330
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 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 pKas of 3.5 and around 8.5. The conjugate bases are the monofluorophosphates, which are hydrolytically robust.

References

  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)
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