Arsenic Pentoxide

Arsenic pentoxide is the inorganic compound with the formula As2O5. This glassy, white, deliquescent solid is relatively unstable, consistent with the rarity of the As(V) oxidation state. More common, and far more important commercially, is arsenic(III) oxide (As2O3). All arsenic compounds are highly toxic and thus find only limited commercial applications.

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Detailed Description for Arsenic Pentoxide

Arsenic is a highly poisonous metallic element in the nitrogen family of group Va in the periodic table. Symbol As; aomic number 33; atomic mass 74.9216; melting point ca 817°C; sublimation point ca 613°C; specific gravity 6.80  or 7.004; 5.73; valence -3, 0, +3, or +5.; electronic config. [Ar]3d104s24p3. It appears in three allotropic forms, yellow, black, and gray. The  stable form is a brittle, steel-gray hexagonal solid that oxidizes rapidly in air, and at high temperatures burns to form a white cloud of arsenic trioxide.  Arsenic and some arsenic compounds sublime when heated and convert to gaseous form. Arsenic is an omnipresent element as arsenic minerals in the various lithosphere or fossil fuels including realgar, orpiment, and arsenopyrite. It is prepared commercially from arsenical pyrites (sulfide ores) by condensation of sublimed gas and by the reduction of white arsenic with carbon.  This element contributes hardness and is used in preparing alloys for hard and corrosion-resistant properties.

Arsenic is added to germanium  to form gallium arsenide used in the production of semiconductor devices like integrated circuits and also used in laser and light-emitting diodes (LEDs) to convert electricity directly into light. Arsenic compounds are used as agricultural pesticides (such as copper and lead arsenates), wood preservative, for glass making, in alloys, electronics, in indigo and calico printing, in tanning, in bronzing and pyrotechnics and in the manufacture of  dyestuffs. Though some organic compounds of arsenic were used in medicine such as Salvarsan, used in the treatment of syphilis and yaws, Arsenic preparations  for medical purpose are no longer recommended. Arsenate is salt or ester of arsenic acid having a negative ion of AsO43- , arsenite is a salt or ester of arsenious acid having a negative ion of AsO43- derived from aqueous solutions of As4O6 and arsenide is a negative, trivalent binary arsenic compound such as H3As or GaAs. Many arsenic compounds are strong poisons

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE white powder
MELTING POINT 315 C (Decomposes)
   
   
SOLUBILITY IN WATER 150g/100ml
   
 

 

NFPA RATINGS

Health: 3 Flammability: 0 Reactivity: 1

 

 
 

 

STABILITY Stable under ordinary conditions

 

APPLICATIONS

Timber treatment, wood preservatives, agricultural chemicals, glass, pharmaceuticals and non-ferrous alloys.


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