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
13092-66-5 (Anhydrous) YesY
15609-87-7 (Dihydrate)
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).
 YesY verify (what isYesY/N?)
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.

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)