Óxido de arsénico(V)

 
Óxido de ársenico(V)
Archivo:Arsenic-pentoxide-3D-polyhedra.png y Arsenic-pentoxide-unit-cell-3D-balls.png
Nombre IUPAC
Óxido de arsénico(V)
General
Otros nombres Pentóxido de diarsénico
Pentaóxido de diarsénico
Óxido arsénico
Fórmula molecular As2O5
Identificadores
Número CAS 1303-28-2[1]​
ChemSpider 14088
PubChem 14771
UNII 4GWL8T475I
InChI=InChI=1S/As2O5/c3-1(4)7-2(5)6
Key: COHDHYZHOPQOFD-UHFFFAOYSA-N
Propiedades físicas
Apariencia Polvo blanco higroscópico
Densidad 4320 kg/m³; 4,32 g/cm³
Masa molar 229,8402 g/mol
Punto de fusión 588 K (315 °C)
Propiedades químicas
Acidez 7= pKa
Solubilidad en agua 59.5 g/100 mL (0 °C)
65.8 g/100 mL (20 °C)
8.20 g/100 mL (100 °C)
Solubilidad Soluble en etanol
Peligrosidad
NFPA 704

0
4
0
Riesgos
LD50 8 mg/kg
Más información Óxido de arsénico(III)
Ácido arsénico
Óxido de fósforo(V)
Valores en el SI y en condiciones estándar
(25 ℃ y 1 atm), salvo que se indique lo contrario.
[editar datos en Wikidata]

El óxido de arsénico(V), óxido arsénico o pentóxido de diarsénico es un compuesto químico inorgánico sólido, vítreo y de color blanco cuyos átomos de arsénico se encuentran en el raro estado de oxidación +5.

Síntesis y reacciones

El óxido de arsénico(V) puede ser obtenido a partir del calentamiento del óxido de arsénico(III) (As2O3) con oxígeno. De hecho, el As2O5 se descomponen en oxígeno y As2O3 bajo la acción del calor.[2]​

Como el óxido de fósforo(V) el As2O5 es higroscópico, se disuelve fácilmente en agua para dar ácido arsénico (H3AsO4)..

Referencias

  1. ↑ Número CAS
  2. ↑ Martin Jansen (1977), "Crystal Structure of As2O5". Angewandte Chemie International Edition in English 16 (5): 314–315 (en inglés)

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