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How is arsenic pentoxide made from arsenious oxide?

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A labeled diagram of the periodic table entry for arsenic, showing its atomic number 33, symbol As, atomic weight 74.921595, electron configuration, and classification as an other nonmetal. Additional icons indicate arsenic is solid at room temperature, has a rhombohedral crystal structure, and weakly acidic oxides. — arsenic Properties of arsenic.

Arsenic pentoxide ( ${As}_{2} O_{5}$ ) is produced by the action of an oxidizing agent on arsenious oxide ( ${As}_{4} O_{6}$ ), which is also commonly known as white arsenic. A common example of an oxidizing agent used for this chemical transformation is nitric acid.12