Arsenic tetroxide is an inorganic compound with the chemical formula As2O4, containing As(III) and As(V), AsIIIAsVO4.

[2] It can be synthesized in an autoclave via the following reaction: It adopts a layer structure, and the coordination geometry of As(III) is triangular pyramid while As(V) is tetrahedral.

[2] This inorganic compound–related article is a stub.

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