Let us learn the chemical composition details of Selenous Acid. Severe hy contractilityfrom a toxic cardiomyopathyand to inappropriatelylow Liquid containing selenium inorganic compounds should be absorbed in vermiculite, dry sand, earth or similar material. Colorless solid, transparent, colorless crystals. Synonyms. including trade names and synonyms. & indicates that no RQ is assigned to this generic or broad class, although the class is a CERCLA hazardous substance. 15498-87-0. Contact with selenious acid often results in skin irritation and burns. Signs and Symptoms of Selenious Acid Exposure: Signs and symptoms of acute selenious acid exposure include the following: garlic odor on breath, drooling, nasal irritation and burning sensation in nostrils, vomiting, hypotension (low blood pressure), dizziness, and poor reflexes. H2NaO3Se. Avoid heating. 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Selenic(IV) acid: Solubility: soluble in ethanol: Melting point: decomposes at 70°C It is highly toxic orally. Selenous Acid is the conjugate acid of a hydrogen selenite and is analogous to sulfurous acid. When heated to decomposition it emits toxic fumes of selenium. (EPA, 1998). Selenious acid has a molecular weight of 128.97 g/mol and a formula of H 2 SeO 3. Chemical formula: H 2 SeO 3: Molecular weight: 128.97 g/mol: Density: 3.0 g/cm 3: IUPAC name: Selenous acid. Pulmonary edema, cardiopulmonary arrest, and coma are possible complications. known to react with the Linear Formula H 2 SeO 3. Selenious acid has a molecular weight of 128.97 g/mol and a formula of H 2 SeO 3. Selenious Acid Injection, USP contains no more than 2,500 mcg/L of aluminum and has a calculated osmolarity of 16 mOsmol/L. National Oceanic and Atmospheric Administration. Isotope is used in labeling radiopharmaceuticals. More info about absorbents, including situations to watch out for... National Oceanic and Atmospheric Administration. Selenious acid is the most toxic form of selenium, ingestion is almost inv hypotension, and death can result several hours post ingestion.