Pyrophosphoric acid

Pyrophosphoric acid

Chembox new
ImageFile = Pyrophosphoric-acid-2D.png ImageName = Chemical structure of pyrophosphoric acid
ImageFile1 = Pyrophosphoric-acid-3D-vdW.png ImageName1 = 3D model of pyrophosphoric acid
IUPACName = diphosphoric acid
μ-oxido-bis(dihydroxidooxidophosphorus)
OtherNames = diphosphoric acid
Section1 = Chembox Identifiers
SMILES = OP(=O)(O)OP(=O)(O)O
CASNo = 2466-09-3
ChemSpiderID = 996
Section2 = Chembox Properties
Formula = H4P2O7
MolarMass = 177.98 g/mol
Density =
MeltingPt = 61 °C
BoilingPt = °C

Pyrophosphoric acid, also known under the name diphosphoric acid, is a syrupy liquid or a viscous off-white solid. [ [http://www.sciencelab.com/xMSDS-Pyrophosphoric_acid-9924773 Material Safety Data Sheet: Pyrophosphoric acid MSDS] ] Pyrophosphoric acid is colorless, odorless, hygroscopic and is soluble in water, diethyl ether, and ethyl alcohol. It is produced from phosphoric acid by dehydration. Pyrophosphoric acid slowly hydrolyzes in the presence of water into phosphoric acid.: 2H3PO4 ⇌ H4P2O7 + H2OPyrophosphoric acid is a medium strong inorganic acid. The anion, the salts, and the esters of pyrophosphoric acid are called pyrophosphates.

ee also

* Sodium pyrophosphate
* Calcium pyrophosphate dihydrate deposition disease
* Dimethylallyl pyrophosphate
* ADP
* ATP
* Ortho acids

References

External links

* [http://www.cem.msu.edu/~reusch/VirtualText/acidity.htm Dissociation constants]
* [http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=217793 Pyrophosphoric acid at PubChem]


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Look at other dictionaries:

  • pyrophosphoric acid — [pī΄rə fäs fôr′ik] n. [ PYRO + PHOSPHORIC] a viscous liquid acid, H4P2O7, which crystallizes when left standing at ordinary temperatures and is easily converted to orthophosphoric acid upon dilution with water …   English World dictionary

  • pyrophosphoric acid — An anhydride of phosphoric acid obtained by heating phosphoric acid to 213°C; it forms pyrophosphates with bases, and its esters are important in energy metabolism and in biosynthesis. * * * py·ro·phos·pho·ric acid fäs .fȯr ik , .fär ; .fäs f(ə… …   Medical dictionary

  • pyrophosphoric acid — noun Etymology: International Scientific Vocabulary Date: 1832 a crystalline acid H4P2O7 formed when orthophosphoric acid is heated or prepared in the form of salts by heating acid salts of orthophosphoric acid …   New Collegiate Dictionary

  • pyrophosphoric acid — noun a) A syrupy liquid formed by the dehydration of phosphoric acid; its salts, the pyrophosphates, are used in medicine. b) The acid formed by removing a molecule of water from two molecules of phosphoric acid, HPO; this reaction slowly reverse …   Wiktionary

  • pyrophosphoric acid — noun a solid acid formed by reactions of orthophosphoric acid • Hypernyms: ↑polyphosphoric acid …   Useful english dictionary

  • pyrophosphoric acid — /ˌpaɪroʊfɒsfɒrɪk ˈæsəd/ (say .puyrohfosforik asuhd) noun the acid H4P2O7, formed by the union of one molecule of phosphorus pentoxide with two molecules of water. It is a water soluble, crystalline powder …  

  • pyrophosphoric acid — /puy roh fos fawr ik, for , puy /, Chem. a crystalline, water soluble powder, H4P2O7, formed by the union of one molecule of phosphorus pentoxide with two molecules of water. [1865 70; PYRO + PHOSPHORIC] * * * …   Universalium

  • pyrophosphoric acid — py′ro•phos•phor′ic ac′id [[t]ˈpaɪ roʊ fɒsˈfɔr ɪk, ˈfɒr , ˌpaɪ [/t]] n. chem. a crystalline, water soluble powder, H4P2O7, used as a catalyst • Etymology: 1865–70 …   From formal English to slang

  • pyrophosphoric — adjective of, or relating to pyrophosphoric acid or its derivatives …   Wiktionary

  • pyrophosphoric — adj. pertaining to pyrophosphoric acid (Chemistry) …   English contemporary dictionary

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