MAGNESIUM PHOSPHITE

MAGNESIUM PHOSPHITE Chemische Eigenschaften,Einsatz,Produktion Methoden

• Beschreibung

  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.

• Physikalische Eigenschaften

  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 Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

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