1.0 2010-04-08 22:11:49 UTC 2025-11-19 00:54:44 UTC FDB015398 Sodium disulfite Food preservative; sanitising agent for food containers and fermentation equipment 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. Disodium disulfite Disodium disulphite Disulfurous acid disodium salt, 9CI Disulfurous acid, sodium salt (1:2) E223 Pyrosulfurous acid disodium salt, 8CI Sodium bisulfite anhydrous Sodium disulfate(IV) Sodium metabisulfite, USAN Sodium metabisulphite Sodium pyrosulfite (Na2S2O5) Na2O5S2 190.107 189.89825384 disodium (sulfinatooxy)sulfinate disodium sulfinatooxysulfinate 7681-57-4 [Na+].[Na+].[O-]S(=O)OS([O-])=O InChI=1S/2Na.H2O5S2/c;;1-6(2)5-7(3)4/h;;(H,1,2)(H,3,4)/q2*+1;/p-2 LDTLADDKFLAYJA-UHFFFAOYSA-L belongs to the class of inorganic compounds known as alkali metal sulfites. These are inorganic compounds in which the largest oxoanion is sulfite, and in which the heaviest atom not in an oxoanion is an alkali metal. Alkali metal sulfites Inorganic compounds Mixed metal/non-metal compounds Alkali metal oxoanionic compounds Alkali metal sulfites Inorganic oxides Inorganic sodium salts Alkali metal sulfite Inorganic oxide Inorganic salt Inorganic sodium salt logp -1.3 ChemAxon pka_strongest_acidic -4.3 ChemAxon iupac disodium (sulfinatooxy)sulfinate ChemAxon average_mass 190.107 ChemAxon mono_mass 189.89825384 ChemAxon smiles [Na+].[Na+].[O-]S(=O)OS([O-])=O ChemAxon formula Na2O5S2 ChemAxon inchi InChI=1S/2Na.H2O5S2/c;;1-6(2)5-7(3)4/h;;(H,1,2)(H,3,4)/q2*+1;/p-2 ChemAxon inchikey LDTLADDKFLAYJA-UHFFFAOYSA-L ChemAxon polar_surface_area 89.49 ChemAxon refractivity 18.63 ChemAxon polarizability 9.27 ChemAxon rotatable_bond_count 2 ChemAxon acceptor_count 4 ChemAxon donor_count 0 ChemAxon physiological_charge -2 ChemAxon formal_charge 0 ChemAxon Specdb::MsMs 1244089 Specdb::MsMs 1244090 Specdb::MsMs 1244091