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sodium metabisulfite : ウィキペディア英語版 | sodium metabisulfite
|Section2= |Section7= |Section8= }} Sodium metabisulfite or sodium pyrosulfite (IUPAC spelling; Br. E. sodium metabisulphite or sodium pyrosulphite) is an inorganic compound of chemical formula Na2S2O5. The substance is sometimes referred to as ''disodium'' (metabisulfite). It is used as a disinfectant, antioxidant and preservative agent. ==Preparation== Sodium metabisulfite can be prepared by evaporating a solution of sodium bisulfite saturated with sulfur dioxide: : 2 HSO3− (unicode:⇌) H2O + S2O52− which leaves solid Na2S2O5 behind.
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