Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Chemical compound
Dithionous acid is a sulfur oxoacid with the chemical formula H2S2O4. It is unstable in pure form,[2] but its salts, known as dithionites, are stable.
It was initially assumed that the C2 symmetric structure HOS(=O)-S(=O)OH is the most stable among molecules with the formula H 2S 2O 4 using ab initio calculations.[2] The reason for this is the existence of intermolecular hydrogen bonds. It is now known that dithionous acid spontaneously decomposes to SO2 and S(OH)2.
Sodium dithionite is a white powder used as a reductant and a bleaching agent. It is also used to reduce the nitro group to an amino group in organic reactions.
^Catherine E. Housecroft; Alan G. Sharpe (2008). "Chapter 16: The group 16 elements". Inorganic Chemistry, 3rd Edition. Pearson. p. 520. ISBN 978-0-13-175553-6.
^ abDrozdova, Yana; Steudel, Ralf; Hertwig, Roland H.; Koch, Wolfram; Steiger, Thomas (1998). "Structures and Energies of Various Isomers of Dithionous Acid, H2S2O4, and of Its Anion HS2O4- 1". The Journal of Physical Chemistry A. 102 (6): 990–996. Bibcode:1998JPCA..102..990D. doi:10.1021/jp972658d.
Dithionousacid is a sulfur oxoacid with the chemical formula H2S2O4. It is unstable in pure form, but its salts, known as dithionites, are stable. It...
S2O32− + 2 HSO3− This behavior is consistent with the instability of dithionousacid. Thus, solutions of sodium dithionite cannot be stored for a long period...
between hydrogen sulfide and dithionousacid. It consists of two hydroxy groups attached to a sulfur atom. Sulfoxylic acid contains sulfur in an oxidation...
An oxyacid, oxoacid, or ternary acid is an acid that contains oxygen. Specifically, it is a compound that contains hydrogen, oxygen, and at least one...
→ 5 Na2SO3 + Na2S + 3 H2O It is formally derived from dithionousacid (H2S2O4), but this acid does not exist in any practical sense. Sodium dithionite...
Potassium dithionite or potassium hydrosulfite is a potassium salt of dithionousacid. The compound has UN number UN 1929. As a dithionite, it is closely...
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