Monomagnesium phosphate

Monomagnesium phosphate is one of the forms of magnesium phosphate. It is a magnesium acid salt of phosphoric acid with the chemical formula Mg(H2PO4)2. Di- and tetrahydrates are known also. It dissolves in water, forming phosphoric acid and depositing a solid precipitate of Mg(HPO4).3H2O, dimagnesium phosphate.[2]

Monomagnesium phosphate[1]
Names
Other names
Monomagnesium orthophosphate;
Magnesium dihydrogen phosphate;
Magnesium phosphate monobasic;
Magnesium biphosphate;
Acid magnesium phosphate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.032.716
E number E343(i) (antioxidants, ...)
UNII
  • InChI=1S/Mg.2H3O4P/c;2*1-5(2,3)4/h;2*(H3,1,2,3,4)/q+2;;/p-2 ☒N
    Key: QQFLQYOOQVLGTQ-UHFFFAOYSA-L ☒N
  • InChI=1/Mg.2H3O4P/c;2*1-5(2,3)4/h;2*(H3,1,2,3,4)/q+2;;/p-2
    Key: QQFLQYOOQVLGTQ-NUQVWONBAA
  • OP(=O)(O)[O-].OP(=O)(O)[O-].[Mg+2]
Properties
H4MgO8P2
Molar mass 218.277 g·mol−1
Appearance White, odorless, crystalline powder
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

As a food additive, it is used as an acidity regulator and has the E number E343.

References
  1. Monomagnesium phosphate, FAO JECFA Monographs 5 (2008)
  2. 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.
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