Fluorophosphoric acid

Fluorophosphoric acid
Names
IUPAC name
Fluorophosphonic acid
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
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 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

  1. 1 2 Charles B. Lindahl, Tariq Mahmood (2000). "Fluorine Compounds, Inorganic, Phosphorus". Kirk‐Othmer Encyclopedia of Chemical Technology. doi:10.1002/0471238961.1608151912091404.a01.
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