CALCIUM PYROPHOSPHATE

Synonym(s):ACP;Dicalcium pyrophosphate

CAS NO.：7790-76-3
Empirical Formula: Ca2O7P2
Molecular Weight: 254.1
MDL number: MFCD00015983
EINECS: 232-221-5
SAFETY DATA SHEET (SDS)
Update Date: 2024-10-29 18:21:28

What is CALCIUM PYROPHOSPHATE?

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

The Uses of CALCIUM PYROPHOSPHATE

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.

The Uses of CALCIUM PYROPHOSPHATE

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

Properties of CALCIUM PYROPHOSPHATE

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.
CAS DataBase Reference	7790-76-3(CAS DataBase Reference)
EPA Substance Registry System	Diphosphoric acid, calcium salt (1:2) (7790-76-3)

Safety information for CALCIUM PYROPHOSPHATE

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes	P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P304+P340:IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P405:Store locked up.