Arsenic oxide (arsenic oxide)

Japanese: 酸化ヒ素(酸化砒素) - さんかひそ(英語表記)arsenic oxide
Arsenic oxide (arsenic oxide)
A general term for oxides of arsenic. Diarsenic trioxide and diarsenic pentoxide, compounds with oxidation states III and V, are known. Diarsenic tetroxide, As 2 O 4, is said to exist, but the details are not known. Diarsenic trioxide, As 2 O 3 , is also called arsenous acid (see the entry for arsenous acid).
[Diarsenic pentoxide]
The chemical formula is As 2 O 5 . Diarsenic trioxide is oxidized with concentrated nitric acid, then evaporated to dryness and dehydrated at 250-300°C. At temperatures above 315°C, it decomposes into diarsenic trioxide and oxygen.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
ヒ素の酸化物の総称。酸化数IIIとVの化合物,三酸化二ヒ素と五酸化二ヒ素とが知られている。四酸化二ヒ素As2O4も存在するというが詳しいことはわかっていない。三酸化二ヒ素As2O3は亜ヒ酸ともいわれる(〈亜ヒ酸〉の項参照)。
[五酸化二ヒ素diarsenic pentoxide]
 化学式As2O5。三酸化二ヒ素を濃硝酸で酸化してから蒸発乾固させ,250~300℃で脱水する。315℃以上で三酸化二ヒ素と酸素に分解する。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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