Difluorophosphoric acid

Difluorophosphoric acid
Names
IUPAC name
difluorophosphinic acid
Identifiers
3D model (JSmol)
ECHA InfoCard 100.034.005
EC Number 237-421-6
UN number 1768
Properties
F2HO2P
Molar mass 101.98 g·mol−1
Appearance colorless liquid
Density 1.583 g/mL
Hazards
GHS pictograms
GHS signal word Danger
H314
P260, P264, P280, P301+330+331, P303+361+353, P304+340, P305+351+338, P310, P321, P363, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Difluorophosphoric acid is an inorganic compound with the formula HPO2F2. It is a colorless liquid. The acid has limited applications, in part because it is thermally and hydrolytically unstable.[1]

It is prepared by hydrolysis of phosphorus oxyfluoride:

POF3 + H2O → HPO2F2 + HF

Further hydrolysis gives monofluorophosphoric acid:

HPO2F2 + H2O → H2PO3F + HF

Complete hydrolysis gives phosphoric acid:

H2PO3F + H2O → H3PO4 + HF

The salts of difluorophosphoric acid are known as difluorophosphates.

References

  1. ↑ 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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