Calcium pyrophosphate

Base Information

• Chemical Name: Calcium pyrophosphate
• CAS No.: 7790-76-3
• Deprecated CAS: 15099-12-4,77308-72-6,847870-11-5,1269629-40-4,1354651-09-4,1431382-02-3,1620054-55-8,1914981-03-5,2243418-01-9,2464713-84-4,2562357-72-4,2743425-22-9,1269629-40-4,1354651-09-4,1431382-02-3,77308-72-6,847870-11-5
• Molecular Formula: Ca.1/2H4O7P2
• Molecular Weight: 256.10
• Hs Code.: 28353100
• European Community (EC) Number: 232-221-5
• UNII: X69NU20D19
• DSSTox Substance ID: DTXSID50872512
• Nikkaji Number: J96.067E
• Wikipedia: Calcium_pyrophosphate
• Wikidata: Q4363460
• NCI Thesaurus Code: C75639
• RXCUI: 1362901
• Mol file: 7790-76-3.mol

Synonyms:Calcium Diphosphate;Calcium Pyrophosphate;Calcium Pyrophosphate (1:1);Calcium Pyrophosphate (1:2);Calcium Pyrophosphate (2:1);Calcium Pyrophosphate Dihydrate;Calcium Pyrophosphate, Monohydrate;Diphosphate, Calcium;Monohydrate Calcium Pyrophosphate;Pyrophosphate Dihydrate, Calcium;Pyrophosphate, Calcium;Pyrophosphate, Monohydrate Calcium

Chemical Property of Calcium pyrophosphate

Chemical Property:

• Appearance/Colour: white powder
• Melting Point: 1230 °C
• PSA: 155.23000
• Density: 3.09 g/cm³
• LogP: 0.94120
• Solubility.: H2O: insoluble(lit.)
• Water Solubility.: Soluble in hydrochloric acid and nitric acid. Insoluble in water.
• Hydrogen Bond Donor Count: 0
• Hydrogen Bond Acceptor Count: 7
• Rotatable Bond Count: 0
• Exact Mass: 253.8371080
• Heavy Atom Count: 11
• Complexity: 124

Purity/Quality:

99.9% ^*data from raw suppliers

CPP ^*data from reagent suppliers

Safty Information:

• Pictogram(s): Xi
• Hazard Codes: Xi
• Statements: 36/37/38
• Safety Statements: 26-36

MSDS Files:

SDS file from LookChem

Total 1 MSDS from other Authors

Useful:

• Chemical Classes: Metals -> Phosphates, Metallic Salts
• Canonical SMILES: [O-]P(=O)([O-])OP(=O)([O-])[O-].[Ca+2].[Ca+2]
• Description: Calcium pyrophosphate has the molecular formula of Ca2P2O7 and the molecular weight of 254.1378 g/mol. It has the CAS number of 7790-76-3. It may be prepared by the solid-state reaction of the dibasic orthophosphate, or alternately by the precipitation of a soluble Ca salt with aqueous pyrophosphoric acid: 2CaHPO4 + heat ? Ca2P2O7 +H2O CaCl2 (aq) +H4P2O7 (aq) ? Ca2P2O7 (solid) + 2HCl (aq) The solid-state reaction produces an amorphous crystal at 240–500°C. b-Ca2P2O7 forms >750°C and a-Ca2P2O7 forms in the temperature range of 1140 to 1350°C. The free energy of formation, △Gf=-3132 kcal/mol. The product of the aqueous method is the dihydrate, Ca2P2O7·2H2O. It is a white powder and has the CAS number of 7790-76-3. It is insoluble in water but soluble in dilute acids. The anhydrate decomposes at 1353°C to form a metaphosphate: Ca2P2O7 + heat ? Ca(PO3)2 + CaOCalcium pyrophosphate is dimorphic. The phase transformation and sintering behaviors of Ca2P2O7 with different phase composition has been investigated by using X-ray powder diffraction (XRD), dilatometery and SEM techniques. It was found that although α-Ca2P2O7 (high-temperature form) could be maintained during its cooling process, it was metastable and retransformed into β-Ca2P2O7 (low-temperature form) at about 950 °C during its reheating process.
• Uses: Calcium Pyrophosphate is a nutrient and dietary supplement that exists as a white odorless powder, insoluble in water. it is used in dental impression materials and as a buffer. Calcium phosphate is used in the production of phosphoric acid and fertilizers. It is used in baking as the acid in a leavening agent. It is also used in cheese products. This compound has also been used in gene transfection of cells. It is also being used in the development of contrast agents.