Sulfoxylic acid
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| Surname | Sulfoxylic acid | |||||||||
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| Molecular formula | H 2 SO 2 | |||||||||
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| Molar mass | 66.08 g mol −1 | |||||||||
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | ||||||||||
Sulfoxylic or Hyposchweflige acid (H 2 SO 2 ) is an at normal conditions unstable oxygen acid of sulfur , the sulfur in the oxidation stage has + II. Just like its formal anhydride, sulfur monoxide (SO), it disproportionates immediately to sulfur and sulfur dioxide (S (IV)) at room temperature . Their salts are called sulfoxylates or hyposulfites. They are strong reducing agents and also unstable, since the sulfoxylate anion easily condenses to thiosulfate in the basic . The sulfinic acid H – S (= O) –OH is tautomeric to the sulfoxylic acid .
Extraction and presentation
Sulphoxylic acid occurs as a non-isolable intermediate product in the hydrolysis of sulfur dihalides (e.g. sulfur dichloride ). In the resulting acidic solution, it is then also slightly reduced to sulfur. Furthermore, sulfoxylic acid can be produced by cathodic reduction of aqueous sulfur dioxide solutions, with the resulting SO 2 2− anion reacting further immediately to form the thiosulfate S 2 O 3 2− . The acid is not created by hydrolysis of sulfur monoxide.
Individual evidence
- ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
- ^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 577.