Pyrophosphoric acid

Pyrophosphoric acid
Names
	IUPAC names Diphosphoric acid; μ-oxido-bis(dihydroxidooxidophosphorus)
	Other names Pyrophosphoric acid; Phosphonophosphoric acid; Phosphono dihydrogenphosphate
Identifiers
CAS Number	2466-09-3 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:29888 ;
ChEMBL	ChEMBL1160571 ;
ChemSpider	996 ;
ECHA InfoCard	100.017.795
IUPHAR/BPS	3151;
PubChem CID	1023;
UNII	4E862E7GRQ ;
CompTox Dashboard (EPA)	DTXSID4075035 ;
	InChI InChI=1S/H4O7P2/c1-8(2,3)7-9(4,5)6/h(H2,1,2,3)(H2,4,5,6) Key: XPPKVPWEQAFLFU-UHFFFAOYSA-N ; InChI=1/H4O7P2/c1-8(2,3)7-9(4,5)6/h(H2,1,2,3)(H2,4,5,6) Key: XPPKVPWEQAFLFU-UHFFFAOYAX;
	SMILES O=P(O)(O)OP(=O)(O)O;
Properties
Chemical formula	H4P2O7
Molar mass	177.97 g/mol
Melting point	71.5 °C (160.7 °F; 344.6 K)
Solubility in water	Extremely soluble
Solubility	Very soluble in alcohol, ether
Conjugate base	Pyrophosphate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Pyrophosphoric acid, also known as diphosphoric acid, is the inorganic compound with the formula H₄P₂O₇ or, more descriptively, [(HO)₂P(O)]₂O. Colorless and odorless, it is soluble in water, diethyl ether, and ethyl alcohol. The anhydrous acid crystallizes in two polymorphs, which melt at 54.3 and 71.5 °C. The compound is a component of polyphosphoric acid, an important source of phosphoric acid. Anions, salts, and esters of pyrophosphoric acid are called pyrophosphates.

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