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Magnesium phosphate is a general term for salts of magnesium and phosphate appearing in several forms and several hydrates: [1] Monomagnesium phosphate (Mg(H 2 PO 4 ) 2 ) . xH 2 O Dimagnesium phosphate (MgHPO 4 ) . xH 2 O
Monomagnesium phosphate is one of the forms of magnesium phosphate. It is a magnesium acid salt of phosphoric acid with the chemical formula Mg(H 2 PO 4) 2. Di- and tetrahydrates are known also. It dissolves in water, forming phosphoric acid and depositing a solid precipitate of Mg(HPO 4). 3H 2 O, dimagnesium phosphate. [2]
Trimagnesium phosphate describes inorganic compounds with formula Mg 3 (PO 4) 2. xH 2 O. They are magnesium acid salts of phosphoric acid, with varying amounts of water of crystallization: x = 0, 5, 8, 22. [2] The octahydrate forms upon reaction of stoichiometric quantities of monomagnesium phosphate (tetrahydrate) with magnesium hydroxide.
Struvite, also referred to as MAP, forms when there is a mole to mole to mole ratio (1:1:1) of magnesium, ammonia and phosphate in the wastewater. The magnesium can be found in soil, seawater as well as drinking water. Ammonia is broken down from the urea in wastewater, and phosphate, which is found through food, soaps and detergents.
Magnesium salts are included in various foods, [100] fertilizers [101] (magnesium is a component of chlorophyll [102]), and microbe culture media. [103] Magnesium sulfite is used in the manufacture of paper (sulfite process). [104] Magnesium phosphate is used to fireproof wood used in construction. [105]
Dimagnesium phosphate is a compound with formula MgHPO 4.It is a Mg 2+ salt of monohydrogen phosphate. The trihydrate is well known, occurring as a mineral. [1]It can be formed by reaction of stoichiometric quantities of magnesium oxide with phosphoric acid.
The following chart shows the solubility of various ionic compounds in water at 1 atm pressure and room temperature (approx. 25 °C, 298.15 K). "Soluble" means the ionic compound doesn't precipitate, while "slightly soluble" and "insoluble" mean that a solid will precipitate; "slightly soluble" compounds like calcium sulfate may require heat to precipitate.
Whitlockite is a mineral, an unusual form of calcium phosphate.Its formula is Ca 9 (MgFe)(PO 4) 6 PO 3 OH. [2] [3] [4] It is a relatively rare mineral but is found in granitic pegmatites, phosphate rock deposits, guano caves and in chondrite meteorites. [4]