Difluorophosphoric acid is an inorganic compound with the formula HPO2F2. It is a mobile colorless strongly fuming liquid.[1] The acid has limited applications, in part because it is thermally and hydrolytically unstable.[3] Difluorophosphoric acid is corrosive to glass, fabric, metals and living tissue.[1]
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IUPAC name
Difluorophosphinic acid[1]
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Other names | |
Identifiers | |
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3D model (JSmol)
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ECHA InfoCard | 100.034.005 |
EC Number |
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PubChem CID
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UNII |
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UN number | 1768 |
CompTox Dashboard (EPA)
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Properties | |
HPO2F2 | |
Molar mass | 101.977 g·mol−1 |
Appearance | Colorless liquid[1] |
Density | 1.583 g/cm3[1][2] |
Melting point | −96.5 °C (−141.7 °F; 176.7 K)[2] |
Boiling point | 115.9 °C (240.6 °F; 389.0 K)[2] |
Structure | |
Tetrahedral at phosphorus atom | |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards
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Corrosive to living tissue |
GHS labelling: | |
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).
Infobox references
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A method to make pure difluorphosphoric acid involves heating phosphoryl fluoride with fluorophosphoric acid and separating the product by distillation:[4]
It is prepared by hydrolysis of phosphoryl fluoride:
Further hydrolysis gives fluorophosphoric acid:
Complete hydrolysis gives phosphoric acid:
The salts of difluorophosphoric acid are known as difluorophosphates.