Magnesium phosphate is the name of a group of salts that contain the ions magnesium and phosphate in various proportion. These salts are provided in the food industry as an acidity regulator.

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Formula and also structure: The chemical structure of the magnesium phosphate salt is basically formed by 1-3 magnesium cations Mg2+ and also 1-2 phosphate ions HPO4-, PO43-. The salts are frequently hydrate, so the framework is surrounded by numerous molecules the water. The name of the main magnesium phosphate salts are: monomagnesium phosphate (Mg(H2PO4)2 that has a molar massive of 120.28 g/mol; dimagnesium phosphate MgHPO4, that has a molar mass of 218.28 g/mol and trimagnesium phosphate Mg3(PO4)2), that has actually a molar mass of 262.85 g/mol. Your chemical structures can be created as below, in the typical representations provided for essential molecules.


Occurrence: this phosphate salt are found in minerals. Because that example, dimagnesium phosphate is generally found in the trihydrate kind as being component of newberyite, besite or natrophilite.

Preparation: Magnesium phosphate salts deserve to be prepared by precipitation used a equipment of tribasic salt phosphate and also magnesium chloride:

Na3PO4 + 3 MgCl2 → 3 Na+ + 6Cl- + Mg3PO4

However, the most typical reaction for creating monomagnesium phosphate is magnesium oxide v phosphoric acid.

MgO + H3PO4 → MgH2PO4 + H2O

with the monomagnesium phosphate salt can be produced the dimagnesium phosphate salt and phosphoric mountain is created as a next product:

Mg(H2PO4)2 + 3 H2O → Mg(HPO4).3H2O + H3PO4

Physical properties: Monomagnesium, dimagnesium and also trimagensium phosphate salts room white, odorless, crystalline powder. The trimagnesium salt has a melting suggest of 1184 ºC, it is insoluble in water yet it is dissolve in saturated solution of NaCl.

Chemical properties: many of phosphates salts space soluble in water, however, magnesium salts room not soluble due to the cation magnesium provides to type insoluble compounds, that is likewise the case of magnesium hydroxide or magnesium sulfate. The phosphate salt are an excellent as mountain regulator due to the phosphate ion resists the change of pH in a solution.

Uses: Magnesium phosphate salts space widely use in the food sector as a acidity regulator. They are also used in the agricultural field, together a fertilizer for crops and soil conditioner.

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Health effects/safety hazards: Magnesium phosphate salt are listed as for sure substances in the us FDA.