Arsenous acid, also known as arsenious acid, is the hydrolyzed form of arsenic trioxide and has the formula As(OH)3. As(OH)3 occurs in aqueous solutions and has not been isolated as a pure material, although this fact does not detract from the significance of As(OH)3.
As(OH)3 is a weak acid with a pKa of 9.2.
Wipo Publishes Patent of Sumitomo Metal Mining, Satoshi Asano, Naoki Kubota, Kazunori Takeda and Shintarou Komori for "Method for Separating Rhenium and Arsenic and Method for Purifying Rhenium" (Japanese Inventors)
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