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City Chemical LLC
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| | MAGNESIUM PHOSPHITE Basic information |
| | MAGNESIUM PHOSPHITE Chemical Properties |
| | MAGNESIUM PHOSPHITE Usage And Synthesis |
| Description | Magnesium phosphite can have the molecular
formula of the hydrogen phosphite, MgHPO3 or the
dihydrogen phosphite, Mg(H2PO3)2. It is the former
that appears when a solution of phosphorous acid is
reacted with the oxide, hydroxide or carbonate:
MgO +H3PO3 ? MgHPO3 +H2O
The product is a hexahydrate. It can also be prepared
by the action of ammonium phosphite on magnesium
chloride:
MgCl2 (aq) +NH4HPO3 (aq) ? MgHPO3·6H2O
+NH4Cl2 (aq)
If a sodium phosphite is used in the preparation, then
the dihydrogen phosphite, Mg(H2PO3)2, is produced. | | Physical properties | The nature of the hydrates of these hydrogenphosphite
salts is controlled, to some extent, by the
solution temperature employed. The hexahydrate,
MgHPO3·6H2O, is obtained at room temperature
(15–25°C). At 30–50°C, the tri-hydrate occurs whereas
at >85°C, the monohydrate is most stable. This is due
in part to the solubilities of these three salts. The hexahydrate
is rather soluble at 16.4 g/100 ml of water (20°C)
whereas the trihydrate is most stable at 50°C. It has
been shown that at reaction temperatures less than
about 60°C a crystalline magnesium hydrogen phosphite
trihydrate, MgHPO3·3H2O, whose solubility
increased from 8.9 at 20°C to 11.2 g/100 ml at 50°C
and then to 6.5 at 95°C temperature. |
| | MAGNESIUM PHOSPHITE Preparation Products And Raw materials |
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