Arsenic pentoxide

Arsenic pentoxide, also known as arsenic(V) oxide, is a chemical compound. Its chemical formula is As₂O₅. It has arsenic and oxide ions in it. The arsenic is in its +5 oxidation state. More common is arsen in its oxidation state +3 as As₂O₃ (arsenic trioxide or arsenic(III) oxide). The LD50 for arsenic pentoxide is 8mg/kg for rats.^[1] When the substance becomes wet, it turns into arsenic acid, which corrodes metals.

Properties

Arsenic pentoxide is a white, odourless solid.^[1] It dissolves easily in water to make arsenic acid. It is highly toxic, as are almost all arsenic compounds.^[1]^[2]^[3] It is a powerful oxidizing agent. It reacts with hydrochloric acid to make chlorine. As₂O₅ breaks down to arsenic trioxide and oxygen when heated to about 300°C.^[4]

As_{2}O_{5}+268.1kJ\rightarrow As_{2}O_{3}+O_{2}

It reacts with bases to make arsenates. The energy for the reaction is taken from the heating.

Preparation

Arsenic pentoxide cannot be produced by burning arsen. That only results in As₂O₃. To produce arsenic pentoxid, arsenic acid will be dehydrated. This is done with phosphorus(V) oxide.

2H_{3}AsO_{4}\rightleftharpoons As_{2}O_{5}+3H_{2}O

The arsenic pentoxide drops out as white powder.^[5]

Uses

Arsenic pentoxide is used to make pesticides and insecticides. It is also used in glass industry.^[6]

Related pages

References

↑ ^1.0 ^1.1 ^1.2 "ARSENIC PENTOXIDE". chemicalland21.com. 2012 [last update]. Retrieved 6 August 2012.
↑ Hudson, T. G. (2012) [last update]. "Toxicity of Arsenic Compounds". Ncbi.NLM.nih.gov. 20 (3): 251. PMC 1039212.
↑ "ARSENIC Toxicity". manbir-online.com. 2012 [last update]. Retrieved 6 August 2012.
↑ Wiberg, Nils; Arnold Holleman (2007). Lehrbuch der Anorganischen Chemie. Berlin, New York: de Gruyter. p. 845. ISBN 978-3-11-017770-1.
↑ Wiberg, Nils; Arnold Holleman (2007). Lehrbuch der Anorganischen Chemie. Berlin, New York: de Gruyter. p. 844. ISBN 978-3-11-017770-1.
↑ "Arsenic pentoxide Manufacturers Suppliers in China CAS No 1303-28-2 | Xilan Chemicals Co Ltd Leading Chemical Manufacturer and Trader". xilanchem.com. 2012 [last update]. Retrieved 6 August 2012.^{[permanent dead link]}

[chemland-1] 1.0 ^1.1 ^1.2 "ARSENIC PENTOXIDE". chemicalland21.com. 2012 [last update]. Retrieved 6 August 2012.

[2] Hudson, T. G. (2012) [last update]. "Toxicity of Arsenic Compounds". Ncbi.NLM.nih.gov. 20 (3): 251. PMC 1039212.

[3] "ARSENIC Toxicity". manbir-online.com. 2012 [last update]. Retrieved 6 August 2012.

[4] Wiberg, Nils; Arnold Holleman (2007). Lehrbuch der Anorganischen Chemie. Berlin, New York: de Gruyter. p. 845. ISBN 978-3-11-017770-1.

[5] Wiberg, Nils; Arnold Holleman (2007). Lehrbuch der Anorganischen Chemie. Berlin, New York: de Gruyter. p. 844. ISBN 978-3-11-017770-1.

[6] "Arsenic pentoxide Manufacturers Suppliers in China CAS No 1303-28-2 | Xilan Chemicals Co Ltd Leading Chemical Manufacturer and Trader". xilanchem.com. 2012 [last update]. Retrieved 6 August 2012.^{[permanent dead link]}

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