Difluorophosphoric acid

Difluorophosphoric acid
Names
	IUPAC name difluorophosphinic acid
Identifiers
CAS Number	13779-41-4;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.034.005
EC Number	237-421-6;
PubChem CID	61681;
UN number	1768
CompTox Dashboard (EPA)	DTXSID6065632 ;
	InChI InChI=1S/F2HO2P/c1-5(2,3)4/h(H,3,4) Key: DGTVXEHQMSJRPE-UHFFFAOYSA-N;
	SMILES OP(=O)(F)F;
Properties
Chemical formula	F2HO2P
Molar mass	101.977 g·mol−1
Appearance	colorless liquid
Density	1.583 g/mL
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314
Precautionary statements	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).
	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[]

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

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[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.CS1 maint: uses authors parameter (link)

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