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Trimagnesium phosphate
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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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| ChEBI | |
| ChemSpider | |
| ECHA InfoCard | 100.028.931 |
| EC Number |
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| 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 product (Ksp) |
1.04×10−24[1] |
| Solubility | Soluble in salt solution |
| −167·10−6 cm3/mol (+4 H2O) | |
| Hazards | |
| 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).
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Trimagnesium phosphate describes inorganic compounds with formula Mg3(PO4)2·nH2O. They are magnesium acid salts of phosphoric acid, with varying amounts of water of crystallization: n = 0, 5, 8, 22.[2]
The octahydrate forms upon reaction of stoichiometric quantities of monomagnesium phosphate (tetrahydrate) with magnesium hydroxide.
- Mg(H2PO4)2 · 4H2O + 2 Mg(OH)2 → Mg3(PO4)2 · 8H2O
The octahydrate is found in nature as the mineral bobierrite.[3]
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.[4]
Safety
Magnesium phosphate tribasic is listed on the FDA's generally recognized as safe, or GRAS, list of substances.[5]
See also
References
- ↑ John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99 ed.). CRC Press. pp. 5–188. ISBN 978-1138561632.
- ↑ 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. S2CID 94458523.
- ↑ "Magnesium phosphate – Compound summary". Retrieved 29 May 2012.
- ↑ 3</sub>(PO<sub>4</sub>)<sub>2</sub>. A note on the reliability of powder diffraction studies"},"author1":{"wt":"Nord, A. G."},"author2":{"wt":"Stefanidis, T."},"journal":{"wt":"Acta Chemica Scandinavica A"},"year":{"wt":"1983"},"volume":{"wt":"37"},"pages":{"wt":"715–p721"},"doi":{"wt":"10.3891/acta.chem.scand.37a-0715"},"doi-broken-date":{"wt":"9 September 2025"},"doi-access":{"wt":"free"}},"i":0}}]}' id="mwdQ"/>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. doi:10.3891/acta.chem.scand.37a-0715 (inactive 9 September 2025).
{{cite journal}}: CS1 maint: DOI inactive as of September 2025 (link) - ↑ "Trimagnesium phosphate". Retrieved 29 May 2012.