Dimagnesium phosphate


Dimagnesium phosphate is a compound with formula MgHPO4. It is a Mg2+ salt of monohydrogen phosphate. The trihydrate is well known, occurring as a mineral.
It can be formed by reaction of stoichiometric quantities of magnesium oxide with phosphoric acid.
Dissolving monomagnesium phosphate in water, forms phosphoric acid and depositing a solid precipitate of dimagnesium phosphate trihydrate:
The compound is used as a nutritional supplement, especially for infants and athletes. Its E number is E343.