Pyrophosphoric acid , ≥95%H4P2O7basis , 2466-09-3

Synonym(s):
Diphosphoric acid

CAS NO.：2466-09-3

Empirical Formula: H4O7P2

Molecular Weight: 177.98

MDL number: MFCD00011343

EINECS: 219-574-0

PRODUCT Properties

• Melting point: 61 °C
• Density: approximate 1.9g/ml (25℃)
• storage temp.: -20°C, Hygroscopic
• solubility: DMSO (Soluble)
• pka: 0.99±0.10(Predicted)
• form: white crystals
• color: white crystals, crystalline
• PH: pKa1= 0.86, pKa2 = 1.76, pKa3 = 5.88, pKa4 = 8.14(25℃)
• Water Solubility: 709g/100mL H2O (23°C); soluble alcohol, ether [MER06]
• Merck: 13,8098
• Stability: Hygroscopic, Moisture Sensitive
• InChIKey: XPPKVPWEQAFLFU-UHFFFAOYSA-N
• CAS DataBase Reference: 2466-09-3(CAS DataBase Reference)
• EPA Substance Registry System: Diphosphoric acid (2466-09-3)

Description and Uses

Pyrophosphoric acid, also known under the name diphosphoric 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.
H4P2O7 +H2O?2H3PO4
Upon heating, phosphoric acid loses water, being converted successively, and to some extent concurrently, into the pyro- and meta-acids:
2H3PO4?H4P2O7 +H2O
nH3PO4?(HPO3)n + [H2O]n

Pyrophosphoric Acid has been shown to enhance the rate of pyrophosphate hydrolysis by nonenzymatic catlysis and by inorganic pyrophoshatase. Pyrophosphoric Acid can be used for the preparation of vanadyl pyrophosphato methoxide cluster anion. Pyrophosphoric Acid is used in anion binding of inorganic phosphates due to is ability to form complexes.

Safety

• Symbol(GHS): GHS05,GHS07
• Signal word: Danger
• Hazard statements: H302-H314
• Precautionary statements: P280-P305+P351+P338-P310
• Hazard Codes: C
• Risk Statements: 22-34
• Safety Statements: 26-36/37/39-45
• RIDADR: UN 3260 8/PG 2
• WGK Germany: 3
• RTECS: JL6672500
• F: 3-9-21
• HazardClass: 8
• PackingGroup: III
• HS Code: 28092000