What is Magnesium Phosphate?

Magnesium Phosphate, Mg3(PO4)2 is an important mineral found in bones, in the seeds of many plants, and in a number of minerals. It is taken as a source of supplemental dietary magnesium. Tribasic magnesium phosphate may be prepared by the interaction of magnesium chloride or sulphate with the phosphate salt. The solution is easily prepared by agitating some salt with carbon dioxide-free water for several hours.

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Other names – Trimagnesium diphosphate, Phosphoric acid magnesium salt

Mg3O8P2Magnesium Phosphate
Density2.195 g/mL at 25 °C(lit)
Molecular Weight/ Molar Mass262.855 g/mol
Hydrogen Bond Acceptor8
Melting Point1,184 °C
Chemical FormulaMg3(PO4)2

Table of Contents

Magnesium Phosphate Structure – Mg3(PO4)2


Physical Properties of Magnesium Phosphate – Mg3(PO4)2

OdourNo odour
AppearanceWhite crystalline powder
Covalently-Bonded Unit5
SolubilitySoluble in salt solution

Chemical Properties of Magnesium Phosphate – Mg3(PO4)2

Mg3(PO4)2 + 6H2O → 2H3PO4 + 3Mg(OH)2

Magnesium Phosphate reacts with hydrochloric acid forms phosphoric acid and magnesium chloride.

Mg3(PO4)2 + 6HCl → 3MgCl2 + 2H3PO4

Uses of Magnesium Phosphate – Mg3(PO4)2

Used as a source for both magnesium and phosphorus. It is used in the minimal supplements.Used in the prevention of vitamin E deficiency.Used in foods at levels not to exceed current good manufacturing practice. The ingredient also may be used in infant formula.Used as a nutrient, pH control agent and stabilizer.

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Frequently Asked Questions

What are the uses of magnesium phosphate?

Magnesium phosphate is widely used in medication in order to support the relaxation of muscles. This compound is also used to prevent the cramping of muscles. Magnesium phosphate is also used to prevent vitamin E deficiency.

What happens when magnesium phosphate is mixed with water?

When treated with water, magnesium phosphate participates produces magnesium hydroxide and phosphoric acid as the products.

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How does magnesium phosphate react with hydrochloric acid?

When reacted with hydrochloric acid, magnesium phosphate gives magnesium chloride and phosphoric acid as the products.