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]

A method to make pure difluorphosphoric acid involves heating phosphoryl fluoride with fluorophosphoric acid and separating the product by distillation:[4]

POF3 + H2PO3F → 2 HPO2F2

It is prepared by hydrolysis of phosphoryl fluoride:

POF3 + H2O → HPO2F2 + HF

Further hydrolysis gives fluorophosphoric 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. ^ a b c d e f g h "Difluorophosphoric acid".
  2. ^ a b c Reed, William (September 1965). Studies of Difluorophosphoric Acid and its Alkali Metal Salts (Thesis). Retrieved 23 April 2023.
  3. ^ Charles B. Lindahl; Tariq Mahmood (2000). "Fluorine Compounds, Inorganic, Phosphorus". Kirk-Othmer Encyclopedia of Chemical Technology. doi:10.1002/0471238961.1608151912091404.a01. ISBN 0-471-23896-1.
  4. ^ Lange, Willy; Livingston, Ralph (March 1950). "Studies of Fluorophosphoric Acids and their Derivatives. XIV. Preparation of Anhydrous Difluorophosphoric Acid". Journal of the American Chemical Society. 72 (3): 1280–1281. Bibcode:1950JAChS..72.1280L. doi:10.1021/ja01159a057.
Allikas: http://en.wikipedia.org/wiki/Difluorophosphoric_acid
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