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.

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 

Yes

HS Code 

28353100

Hazardous Substances Data

7790-76-3(Hazardous Substances Data)

MSDS

• Language:English Provider:ACROS
• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

CALCIUM PYROPHOSPHATE Usage And Synthesis

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 + 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.

Chemical Properties

white powder

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.

Uses

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.

Definition

ChEBI: Calcium diphosphate is a calcium phosphate. It contains a diphosphate(4-).

Flammability and Explosibility

Non flammable

CALCIUM PYROPHOSPHATE(7790-76-3)Related Product Information

• Barium carbonate
• Ammonium phosphate dibasic
• calcium bicarbonate
• GLY-PHE P-NITROANILIDE
• Calcium hydroxyphosphate
• Calcium phosphate monobasic
• Sodium Monofluorophosphate
• BARIUM PYROPHOSPHATE
• distrontium diphosphate
• STRONTIUM METAPHOSPHATE
• Beryllium Pyrophosphate
• Radium Pyrophosphate
• Calcium phosphate
• Calcium
• Pyrophosphoric acid
• CALCIUM PYROPHOSPHATE
• Calcium pyrophosphate dihydrate