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Sulfur oxoacids

The sulfur oxoacids are chemical compounds that contain sulfur, oxygen and hydrogen. The best known and most important industrially, is sulfuric acid. Sulfur has a number of oxo acids however some of these are only known from their salts (these are shown in italics in the table below. The acids that have been characterised contain a variety of structural features for example

  • tetrahedral sulfur when coordinated to oxygen
  • terminal and bridging oxygen atoms
  • terminal and bridging peroxo groups
  • terminal S=S
  • chains of (-Sn-)
Acid Formula S oxdtn state Structure Related anions Notes
Sulfuric acid H2SO4 VI Sulfate, SO42− and hydrogen sulfate commonly known as bisulfate Best known and industrially significant
Disulfuric acid or pyrosulfuric acid H2S2O7 VI Disulfate commonly known as pyrosulfate, S2O72− Pure form melts at 36°C. Present in fuming sulfuric acid, oleum
Peroxymonosulfuric acid H2SO5 VI Peroxymonosulfate, OOSO32− "Caro's acid", a solid melting at 45°C
Peroxydisulfuric acid H2S2O8 VI Peroxydisulfate, O3SOOSO32− A solid melting at 65°C.
Dithionic acid H2S2O6 V Dithionate, O3SSO32− Not obtained pure, only concentrated solutions
Thiosulfuric acid H2S2O3 IV Thiosulfate, S2O32−
Hydrogenthiosulfate HS2O3 (ammonium salt prepared in anhydrous methanol at -80 °C [1])
Aqueous solutions decompose.
Disulfurous acid H2S2O5 IV Disulfite commonly known as metabisulfite, S2O52− Not known
Sulfurous acid H2SO3 IV Bisulfite, HSO3 and sulfite, SO32− Not known.
Dithionous acid H2S2O4 III Dithionite, O2SSO22− Not known.
Polythionic acid H2SxO6 Polythionate, O3S(Sx-2)SO32−. Example tetrathionate. Examples known with x= 3, 4, 5, 6, 7, 8, 10, 12, 14.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Sulfur_oxoacids". A list of authors is available in Wikipedia.
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