Dimagnesium phosphate is a compound with formula MgHPO4. It is a Mg2+ salt of monohydrogen phosphate. The trihydrate is well known, occurring as a mineral.[1]
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| Other names
Magnesium hydrogen phosphate; Magnesium phosphate dibasic
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.028.930 |
| EC Number |
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| E number | E343(ii) (antioxidants, ...) |
PubChem CID
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| UNII |
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CompTox Dashboard (EPA)
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| Properties | |
| HMgO4P | |
| Molar mass | 120.283 g·mol−1 |
| Density | 2.13 g/cm3 trihydrate |
| Hazards | |
| NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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It can be formed by reaction of stoichiometric quantities of magnesium oxide with phosphoric acid.
- MgO + H3PO4 → MgHPO4 + H2O
Dissolving monomagnesium phosphate in water, forms phosphoric acid and depositing a solid precipitate of dimagnesium phosphate trihydrate:
- Mg(H2PO4)2 + 3 H2O → Mg(HPO4).3H2O + H3PO4
The compound is used as a nutritional supplement, especially for infants and athletes. Its E number is E343.[2]
See also
editReferences
edit- ^ Klaus Schrödter; Gerhard Bettermann; Thomas Staffel; Friedrich Wahl; Thomas Klein; Thomas Hofmann (2008). "Phosphoric Acid and Phosphates". Ullmann's Encyclopedia of Industrial Chemistry. Ullmann’s Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a19_465.pub3. ISBN 978-3527306732. S2CID 94458523.
- ^ relevant part of the German “Zusatzstoff-Zulassungsverordnung Archived 2012-05-18 at the Wayback Machine”, the official German implementation of the respective regulation of the European Union
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