Dimagnesium phosphate

Last updated
Dimagnesium phosphate
Magnesium phosphate dibasic.png
Names
Other names
Magnesium hydrogen phosphate; Magnesium phosphate dibasic
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.028.930 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 231-823-5
E number E343(ii) (antioxidants, ...)
PubChem CID
UNII
  • InChI=1S/Mg.H3O4P/c;1-5(2,3)4/h;(H3,1,2,3,4)/q+2;/p-2 X mark.svgN
    Key: MHJAJDCZWVHCPF-UHFFFAOYSA-L X mark.svgN
  • O=P([O-])(O)[O-].[Mg+2]
Properties
HMgO4P
Molar mass 120.283 g·mol−1
Density 2.13 g/cm3 (trihydrate)
Hazards
NFPA 704 (fire diamond)
NFPA 704.svgHealth 0: Exposure under fire conditions would offer no hazard beyond that of ordinary combustible material. E.g. sodium chlorideFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
0
0
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Dimagnesium phosphate is a compound with formula MgHPO4. It is a Mg2+ salt of monohydrogen phosphate. The trihydrate is well known, occurring as the mineral newberyite. [1]

It can be formed by reaction of stoichiometric quantities of magnesium oxide with phosphoric acid.

MgO + H3PO4 → MgHPO4 + H2O

If monomagnesium phosphate is dissolved in water, it forms phosphoric acid and deposits 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

References

  1. ↑ 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.
  2. ↑ 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
Newberyite, the mineral composed of dimagnesium phosphate. Newberyite-38303.jpg
Newberyite, the mineral composed of dimagnesium phosphate.
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