Phosphorus trioxide

Bezeichnung:Phosphorus trioxide

CAS-Nr1314-24-5

Englisch Name:Phosphorus trioxide

CBNumberCB2852146

SummenformelH4O5P2

Molgewicht145.976282

MOL-Datei1314-24-5.mol

Phosphorus trioxide physikalisch-chemischer Eigenschaften

Schmelzpunkt

23.8°

Siedepunkt

bp 173.1° in nitrogen atm

Dichte

d421 2.135

Löslichkeit

reacts with H2O

Aggregatzustand

colorless monoclinic crystals or liquid

Farbe

colorless monoclinic crystals, crystalline or liquid

Wasserlöslichkeit

slowly forms H3PO3 in cold H2O; reacts violently in hot H2O forming red P, PH3, and H3PO4 [MER06]

crystal system

Monoclinic

Space group

P21/m

Lattice constant

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.643	0.7887	0.6812	90	106.01	90	0.3321

EPA chemische Informationen

Phosphorus trioxide (1314-24-5)

Sicherheit

RIDADR	2578
HazardClass	8
PackingGroup	III

Phosphorus trioxide Chemische Eigenschaften,Einsatz,Produktion Methoden

Chemische Eigenschaften
transparent crystal(s); monoclinic or colorless liquid; disproportionates to red P and P2O4if heated above 210°C [MER06]
Allgemeine Beschreibung
White crystalline solid or a liquid (melting point 24°C). Density 2.14 g / cm3. Toxic and corrosive. May severely irritate skin and eyes. Used to make other chemicals.
Air & Water Reaktionen
Fumes in air. Reacts slowly with cold water to give phosphorous acid. Reacts vigorously with hot water to generate red phosphorus, phosphine (highly toxic and flammable) and phosphoric acid [Merck 11th ed. 1989].
Reaktivität anzeigen
Phosphorus trioxide reacts exothermically with bases. Melted Phosphorus trioxide readily ignites in air. Instantly ignites with a flame of almost blinding brilliance when thrown into oxygen at 50-60°C [J. Am. Chem. Soc. 125:347. 1924]. Incompatible with ammonia, disulfur dichloride, halogens, oxygen, phosphorus pentachloride, sulfur, sulfuric acid, water [Bretherick, 5th ed., 1995, p. 1778].
Health Hazard
TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe injury, burns or death. Reaction with water or moist air will release toxic, corrosive or flammable gases. Reaction with water may generate much heat that will increase the concentration of fumes in the air. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.
Brandgefahr
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars etc.). Substance will react with water (some violently), releasing corrosive and/or toxic gases and runoff. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water.

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