Difluorophosphoric acid

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Difluorophosphoric acid
HPO2F2.svg
Names
IUPAC name
difluorophosphinic acid
Identifiers
3D model (JSmol)
ECHA InfoCard 100.034.005 Edit this at Wikidata
EC Number
  • 237-421-6
UNII
UN number 1768
  • InChI=1S/F2HO2P/c1-5(2,3)4/h(H,3,4)
    Key: DGTVXEHQMSJRPE-UHFFFAOYSA-N
  • OP(=O)(F)F
Properties
F2HO2P
Molar mass 101.977 g·mol−1
Appearance colorless liquid
Density 1.583 g/mL
Hazards
GHS labelling:
GHS05: Corrosive
Danger
H314
P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, 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).

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[edit]

  1. ^ Charles B. Lindahl, Tariq Mahmood (2000). "Fluorine Compounds, Inorganic, Phosphorus". Kirk‐Othmer Encyclopedia of Chemical Technology. doi:10.1002/0471238961.1608151912091404.a01. ISBN 0471238961.{{cite encyclopedia}}: CS1 maint: uses authors parameter (link)