Name:Sodium thiosulfate
Synonyms:Sodium hyposulfite; Sodium subsulfite
Molecular Formula:Na2S2O3
Molecular Weight:158.10
CAS Registry Number:7772-98-7
EINECS:231-867-5
Sodium thiosulfate (Na2S2O3), also spelled sodium thiosulphate, is a colorless crystalline compound that is more familiar as the pentahydrate, Na2S2O35H2O, an efflorescent, monoclinic crystalline substance also called sodium hyposulfite or hypo.
The thiosulfate anion is tetrahedral in shape and is notionally derived by replacing one of the oxygen atoms by a sulfur atom in a sulfate anion. The S-S distance indicates a single bond, implying that the sulfur bears significant negative charge and the S-O interactions have more double bond character. The first protonation of thiosulfate occurs at sulfur.
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