page_title: Arsenic
section_title: Preparation
hierarchical_section_title: Arsenic / Preparation
context_page_description: Arsenic is chemical element 33 on the periodic table. Its symbol is As. Its atomic number is 33 and its atomic mass is 74.92. It is in the pnictogen group on the periodic table.
context_section_description: Most arsenic is made from the waste products after other metals are processed. Only China actually mines arsenic.
  Arsenic is made from arsenopyrite by heating it. This makes arsenic trioxide which sublimes (along with sulfur dioxide), while the iron oxide stays behind. The arsenic trioxide is condensed, while the sulfur dioxide does not condense. The arsenic trioxide can be reduced with carbon. Another way is to heat the arsenopyrite without air. Then gray arsenic is made. Realgar can be heated to make arsenic trioxide as well.
caption: Arsenic flame test
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