Monomagnesium phosphate

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Monomagnesium phosphate[1]
Magnesium phosphate monobasic.png
Other names
Monomagnesium orthophosphate;
Magnesium dihydrogen phosphate;
Magnesium phosphate monobasic;
Magnesium biphosphate;
Acid magnesium phosphate
3D model (JSmol)
ECHA InfoCard 100.032.716
E number E343(i) (antioxidants, ...)
Molar mass 218.28 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

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]

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


  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. Weinheim: Wiley-VCH. doi:10.1002/14356007.a19_465.pub3.