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thiosulfuric acid[¦thī·ə‚səl′fyu̇r·ik ′as·əd]
H2S2O3 An unstable acid that decomposes readily to form sulfur and sulfurous acid.
(H2S2O3), an unstable dibasic acid that has not been obtained in the free state. It is a derivative of sulfuric acid in which one oxygen atom is replaced by a sulfur atom. The salts of thiosulfuric acid—thiosulfates—have found practical application.