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.

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.

This inorganic compound–related article is a stub.