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
• InChI: InChI=1S/H4O7P2/c1-8(2,3)7-9(4,5)6/h(H2,1,2,3)(H2,4,5,6)
• InChIKey: XPPKVPWEQAFLFU-UHFFFAOYSA-N
• SMILES: P(OP(O)(=O)O)(O)(O)=O
• 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 +H2O2H3PO4
Upon heating, phosphoric acid loses water, being converted successively, and to some extent concurrently, into the pyro- and meta-acids:
2H3PO4H4P2O7 +H2O
nH3PO4(HPO3)n + [H2O]n

Catalyst, manufacture of organic phosphate esters, metal treatment, stabilizer for organic per- oxides.

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
• Storage Class: 8B - Non-combustible corrosive hazardous materials
• Hazard Classifications: Acute Tox. 4 Oral; Skin Corr. 1B