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・ Barium carbonate
・ Barium chlorate
・ Barium chloride
・ Barium chloride (data page)
・ Barium chromate
・ Barium cyanide
・ Barium ferrate
・ Barium ferrite
・ Barium fluoride
・ Barium hydroxide
・ Barium hydroxide (data page)
・ Barium hypochlorite
・ Barium iodate
・ Barium iodide
・ Barium manganate
Barium metaphosphate
・ Barium nitrate
・ Barium nitrate (data page)
・ Barium orthotitanate
・ Barium oxalate
・ Barium oxide
・ Barium oxide (data page)
・ Barium perchlorate
・ Barium permanganate
・ Barium peroxide
・ Barium Springs, North Carolina
・ Barium star
・ Barium sulfate
・ Barium sulfate suspension
・ Barium sulfide


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Barium metaphosphate : ウィキペディア英語版
Barium metaphosphate

Barium metaphosphate is an inorganic substance with the molecular formula Ba(PO3)2. It is a colourless solid that is insoluble in water. X-ray crystallography shows that this material is composed of Ba2+ cations attached to a polyphosphate ((PO3)n) anion.〔"Form of barium metaphosphate" Grenier, Jean C.; Martin, Claude M.; Durif, Andre; Tran Qui Duc; Guitel, J. C. Bulletin de la Societe Francaise de Mineralogie et de Cristallographie (1967), vol. 90, 24-31.〕 A number of hydrated forms are known which are actually cyclic metaphosphates, Ba2(P4O12)·3.5H2O, Ba3(P3O9)2·6H2O.
==Preparation==
Barium metaphosphate can be prepared by the reaction of barium carbonate with metaphosphoric acid:〔-
:BaCO3 + 2HPO3 → Ba(PO3)2 +CO2 +H2O
or alternatively by the aqueous reaction of barium chloride and sodium metaphosphate:〔-
BaCl2(aq) + 2NaPO3(aq) → Ba(PO3)2 + 2NaCl

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