Sodium arsenite usually refers to the inorganic compound with the formula NaAsO2. Also called sodium meta-arsenite, it is the sodium salt of arsenous acid. Sodium arsenite also ) Na3AsO3, called sodium ortho-arsenite.The compounds are colourless solids.
S 1638 (OTTO) Sodium arsenite 0.05M (0.1N) standardized solution - used such as hide preservative, antiseptic, dyeing, and soaps.