Trimagnesium phosphate
Trimagnesium phosphate describes inorganic compounds with formula Mg3(PO4)2.xH2O. They are magnesium acid salts of phosphoric acid, with varying amounts of water of crystallization: x = 0, 5, 8, 22.[1]
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| Names | |
|---|---|
| IUPAC name
Trimagnesium Diphosphate | |
| Other names
magnesium phosphate, phosphoric acid, magnesium salt (2:3), tertiary magnesium phosphate, trimagnesium phosphate | |
| Identifiers | |
3D model (JSmol) |
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| ECHA InfoCard | 100.028.931 |
| E number | E343 (antioxidants, ...) |
| 15662 | |
PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| Mg3O8P2 | |
| Molar mass | 262.855 g·mol−1 |
| Appearance | White crystalline powder |
| Melting point | 1,184 °C (2,163 °F; 1,457 K) |
| Insoluble | |
| Solubility | Soluble in salt solution |
| −167·10−6 cm3/mol (+4 H2O) | |
| Hazards | |
| R-phrases (outdated) | R25, R36, R37, R38 |
| NFPA 704 (fire diamond) | |
| Flash point | N/A |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
The octahydrate forms upon reaction of stoichiometric quantities of monomagnesium phosphate with magnesium hydroxide.
- Mg(H2PO4)2 + Mg(OH)2 → Mg3(PO4)2•8H2O
The octaohydrate is found in nature as the mineral bobierrite.[2]
The anhydrous compound is obtained by heating the hydrates to 400 °C. It is isostructural with cobalt(II) phosphate. The metal ions occupy both octahedral (six-coordinate) and pentacoordinate sites in a 1:2 ratio.[3]
Safety
Magnesium phosphate tribasic is listed on the FDA's generally recognized as safe, or GRAS, list of substances.[4]
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See also
References
- Klaus Schrödter; Gerhard Bettermann; Thomas Staffel; Friedrich Wahl; Thomas Klein; Thomas Hofmann (2008). "Phosphoric Acid and Phosphates". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a19_465.pub3. ISBN 978-3527306732.
- "magnesium phosphate - Compound Summary". Retrieved 29 May 2012.
- Nord, A. G.; Stefanidis, T. (1983). "Structure of cobalt(II) phosphate Structure Refinements of Co3(PO4)2. A Note on the Reliability of Powder Diffraction Studies". Acta Chemica Scandinavica A. 37: 715–p721.CS1 maint: uses authors parameter (link)
- "TRIMAGNESIUM PHOSPHATE". Retrieved 29 May 2012.
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