Barium metaphosphate

Source: Wikipedia, the free encyclopedia.
Not to be confused with barium phosphate.
Barium metaphosphate
Names
IUPAC name
barium(2+); dioxido(oxo)phosphanium
Identifiers
3D model (
JSmol
)
ChemSpider
ECHA InfoCard
 100.033.951 Edit this at Wikidata
EC Number
  • 237-362-6
  • InChI=1S/Ba.2HO3P/c;2*1-4(2)3/h;2*(H,1,2,3)/q+2;;/p-2
    Key: XNJIKBGDNBEQME-UHFFFAOYSA-L
SMILES
  • [O-][P+](=O)[O-].[O-][P+](=O)[O-].[Ba+2]
Properties
Ba(PO3)2
Molar mass 295.27 g/mol
Appearance Powder[1]
Density 3.63 g/cm3
Melting point 1,560[2] °C (2,840 °F; 1,830 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Barium metaphosphate is an inorganic substance with the molecular formula Ba(PO3)2. It is a colourless solid that is insoluble in water, though is soluble in acidic solutions through "slow dissolution".[3] X-ray crystallography shows that this material is composed of Ba2+ cations attached to a polyphosphate ((PO3−)n) anion.[4] A number of hydrated forms are known which are actually cyclic metaphosphates, Ba2(P4O12)·3.5H2O, Ba3(P3O9)2·6H2O.[citation needed]

Structure of a subunit of linear polyphosphate anion.

Preparation

Barium metaphosphate can be prepared by the reaction of barium carbonate with metaphosphoric acid:[citation needed]

BaCO3 + 2HPO3 → Ba(PO3)2 +CO2 +H2O

or alternatively by the aqueous reaction of barium chloride and sodium metaphosphate:[citation needed] BaCl2(aq) + 2NaPO3(aq) → Ba(PO3)2 + 2NaCl

Applications

The combination of soda and barium polyphosphate forms a low-melting

borosilicate glasses soften above the melting point of aluminium. This mixture is prepared by heating a mixture of diammonium phosphate, sodium carbonate, and barium carbonate.[5]

References

  1. ^ Elements, American. "Barium Metaphosphate". American Elements. Retrieved 17 April 2018.
  2. ^ "BARIUM METAPHOSPHATE - 13762-83-9". www.chemicalbook.com. Retrieved 17 April 2018.
  3. ^ "Barium Metaphosphate". Chemical Book. 2017. Retrieved November 27, 2017.
  4. ^ "Form of barium metaphosphate" Grenier, Jean C.; Martin, Claude M.; Durif, Andre; Tran Qui Duc; Guitel, J. C. Bulletin de la Société Francaise de Minéralogie et de Cristallographie (1967), vol. 90, 24-31.
  5. doi:10.1016/S0022-3093(99)00642-0
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