Trimagnesium phosphate
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| Template:Longitem | 15662 |
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| Template:Longitem | Template:Chembox Elements/molecular formula |
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| Appearance | White crystalline powder |
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| Template:Longitem | 1.04Template:E[1] |
| Solubility | Soluble in salt solution |
| Template:Longitem | −167·10−6 cm3/mol (+4 H2O) |
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Trimagnesium phosphate describes inorganic compounds with formula Mg3(PO4)2·nH2O. They are magnesium acid salts of phosphoric acid, with varying amounts of water of crystallization: n = 0, 5, 8, 22.[2]
The octahydrate forms upon reaction of stoichiometric quantities of monomagnesium phosphate (tetrahydrate) with magnesium hydroxide.
The octahydrate is found in nature as the mineral bobierrite.[3]
The anhydrous compound is obtained by heating the hydrates to 400 °C. It is isostructural with cobalt(II) phosphate. The metal ions occupy both octahedral (six-coordinate) and pentacoordinate sites in a 1:2 ratio.[4]
Safety
Magnesium phosphate tribasic is listed on the FDA's generally recognized as safe, or GRAS, list of substances.[5]
See also
References
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