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CALCIUM PYROPHOSPHATE CAS# 7790-76-3
CAS Number: 7790-76-3
Chemical Formula: Ca2O7P2
Synonyms:
CALCIUM PHOSPHATE (PYRO)
CALCIUM PYROPHOSPHATE
CALCIUM DIPHOSPHATE
MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)
Appearance: White Powder
CALCIUM PYROPHOSPHATE CAS#7790-76-3
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 + CaO
Calcium 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.
CALCIUM PYROPHOSPHATE Chemical Properties |
Melting point | 1230 °C |
density | 3.09 g/mL at 25 °C(lit.) |
solubility | H2O: insoluble(lit.) |
form | Powder |
Specific Gravity | 3.09 |
color | White |
Odor | at 100.00?%. odorless |
Water Solubility | Soluble in hydrochloric acid and nitric acid. Insoluble in water. |
Cosmetics Ingredients Functions | ABRASIVE |
LogP | -3.420 (est) |
CAS DataBase Reference | 7790-76-3(CAS DataBase Reference) |
EPA Substance Registry System | Diphosphoric acid, calcium salt (1:2) (7790-76-3) |
Safety Information |
Hazard Codes | Xi |
Risk Statements | 36/37/38 |
Safety Statements | 26-36 |
WGK Germany | 3 |
TSCA | TSCA listed |
HS Code | 28353100 |
Hazardous Substances Data | 7790-76-3(Hazardous Substances Data) |
Product Application of CALCIUM PYROPHOSPHATE CAS#7790-76-3
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.
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