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How is arsenious oxide purified after it is collected?

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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.

After arsenious oxide (also known as white arsenic) is collected as a vapor and condensed in brick chambers, it is purified through the process of resublimation. This refined material then serves as the primary starting point for the production of most other arsenic compounds, including its reduction into metallic arsenic using carbon.1