Arsenous acid

Arsenous acid is the weak, unstable arsenic(III) acid commonly represented as As(OH)₃. In water, it exists mainly as neutral As(OH)₃ rather than as a persistent isolated molecular acid.

Arsenic contamination of groundwater: Arsenic contamination of groundwater is the presence of dissolved arsenic at levels that can threaten health. Arsenous acid and its related arsenite forms can occur in reducing groundwater.
Arsenic: Arsenic is a chemical element with symbol As and atomic number 33. Its +3 oxidation state and bonding determine arsenous acid’s composition.
Phosphorous acid: Phosphorous acid is a phosphorus(III) oxoacid with formula H₃PO₃ and structure HPO(OH)₂. Its analogous name masks a structural difference: phosphorous acid has one P–H bond, unlike As(OH)₃.
Arsenic compounds: Arsenic compounds are substances containing arsenic bonded to one or more other elements. Arsenous acid belongs to this broad chemical family, whose formulas changed with advances in analysis.
Arsenic removal from water: Arsenic removal from water comprises treatment methods that lower dissolved arsenic concentrations. Arsenic(III) is often harder to remove than arsenic(V), so treatment may first oxidize it.
Oxoacid: An oxoacid is an acid containing oxygen bonded to a central atom and bearing ionizable hydrogen atoms. Arsenous acid is an oxygen-containing acid whose hydroxyl groups can lose protons.
Arsine: Arsine is the highly toxic hydride AsH₃, in which arsenic is bonded to hydrogen. Arsine is a reduced, volatile arsenic compound, unlike oxygen-rich arsenous acid.
Antoine Lavoisier: Antoine Lavoisier was a French chemist who helped establish modern chemical nomenclature and conservation principles. His chemical nomenclature helped standardize the naming of oxygen-containing acids and their compounds.
Arsenic poisoning: Arsenic poisoning is illness caused by exposure to toxic arsenic compounds. Arsenous acid belongs to the arsenic(III) chemistry associated with toxic exposures.
Oxidation state: An oxidation state is a formal charge assigned to an atom under a set of bonding conventions. Arsenic has oxidation state +3 in arsenous acid, distinguishing it from arsenic acid.

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