Dithionous acid: Difference between revisions

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	{{Chembox		{{Chembox
	\| verifiedrevid = ~~451931033~~		\| verifiedrevid = 451984881
	\| ImageFileL1 = Dithionous acid.svg		\| ImageFileL1 = Dithionous acid.svg
	\| ImageSizeL1 = 120px
	\| ImageFileR1 = Dithionous-acid-3D-balls.png		\| ImageFileR1 = Dithionous-acid-3D-balls.png
	\| ImageSizeR1 = 120px
	\| IUPACName = Dithionous acid		\| IUPACName = Dithionous acid
	\| OtherNames = Hydrosulfurous acid; Hyposulfurous acid		\| OtherNames = Hydrosulfurous acid; Hyposulfurous acid
	\| Section1 = {{Chembox Identifiers		\|Section1={{Chembox Identifiers
	\| CASNo = 15959-26-9		\| CASNo = 15959-26-9
	\| CASNo_Ref = {{cascite\|correct\|~~CAS~~}}		\| CASNo_Ref = {{cascite\|correct\|??}}
	\| PubChem = 24490		\| PubChem = 24490
	\| ChemSpiderID_Ref = {{chemspidercite\|correct\|chemspider}}		\| ChemSpiderID_Ref = {{chemspidercite\|correct\|chemspider}}
	\| ChemSpiderID = 22898		\| ChemSpiderID = 22898
			\| ChEBI_Ref = {{ebicite\|correct\|EBI}}
	\| ChEBI = 29253		\| ChEBI = 29253
	\| SMILES = O=S(O)S(=O)O		\| SMILES = O=S(O)S(=O)O
	\| StdInChI_Ref = {{stdinchicite\|correct\|chemspider}}		\| StdInChI_Ref = {{stdinchicite\|correct\|chemspider}}
	\| StdInChI = 1S/H2O4S2/c1-5(2)6(3)4/h(H,1,2)(H,3,4)		\| StdInChI = 1S/H2O4S2/c1-5(2)6(3)4/h(H,1,2)(H,3,4)
	\| StdInChIKey_Ref = {{stdinchicite\|correct\|chemspider}}		\| StdInChIKey_Ref = {{stdinchicite\|correct\|chemspider}}
	\| StdInChIKey = GRWZHXKQBITJKP-UHFFFAOYSA-N		\| StdInChIKey = GRWZHXKQBITJKP-UHFFFAOYSA-N
	\| InChI = 1/H2O4S2/c1-5(2)6(3)4/h(H,1,2)(H,3,4)		\| InChI = 1/H2O4S2/c1-5(2)6(3)4/h(H,1,2)(H,3,4)
	\| InChIKey = GRWZHXKQBITJKP-UHFFFAOYAX		\| InChIKey = GRWZHXKQBITJKP-UHFFFAOYAX
	}}		}}
	\| Section2 = {{Chembox Properties		\|Section2={{Chembox Properties
	\| Formula = H<sub>2</sub>S<sub>2</sub>O<sub>4</sub>		\| Formula = H<sub>2</sub>S<sub>2</sub>O<sub>4</sub>
	\| MolarMass = 130.144 g/mol		\| MolarMass = 130.144 g/mol
	\| Appearance =		\| Appearance =
	\| Density =		\| Density =
	\| MeltingPt =		\| MeltingPt =
	\| BoilingPt =		\| BoilingPt =
	\| Solubility =		\| Solubility =
			\| ConjugateBase = ]
			\| pKa = 0.35, 2.45 <ref name="InorgChem">{{cite book
			\| title = Inorganic Chemistry, 3rd Edition
			\| chapter = Chapter 16: The group 16 elements
			\| author1 = Catherine E. Housecroft
			\| author2 = Alan G. Sharpe
			\| publisher = Pearson
			\| year = 2008
			\| isbn = 978-0-13-175553-6
			\| page = 520
			}}</ref>
	}}		}}
	\| Section3 = {{Chembox Hazards		\|Section3={{Chembox Hazards
	\| MainHazards =		\| MainHazards =
	\| FlashPt =		\| FlashPt =
	\| ~~Autoignition~~ =		\| AutoignitionPt =
			}}
			\|Section4={{Chembox Related
			\| OtherCompounds = ]<br />]<br />]
	}}		}}
	}}		}}

	'''Dithionous acid''' is a ] with the chemical formula H<sub>2</sub>S<sub>2</sub>O<sub>4</sub>. It is ~~unstable~~ in ~~pure~~ ~~form,~~<ref>{{cite journal \| doi = 10.1021/jp972658d \| title = Structures and Energies of Various Isomers of Dithionous Acid, H2S2O4, and of Its Anion HS2O4- 1 \| year = 1998 \| last1 = Drozdova \| first1 = Yana \| last2 = Steudel \| first2 = Ralf \| last3 = Hertwig \| first3 = Roland H. \| last4 = Koch \| first4 = Wolfram \| last5 = Steiger \| first5 = Thomas \| journal = The Journal of Physical Chemistry A \| volume = 102 \| issue = 6 \| pages = ~~990~~}}</ref> ~~but~~ ~~its~~ ], ~~known~~ as ]s, ~~are~~ ~~stable~~.		'''Dithionous acid''' is a ] with the chemical formula H<sub>2</sub>S<sub>2</sub>O<sub>4</sub>. It has not been observed experimentally.<ref name="drozdova">{{cite journal \| doi = 10.1021/jp972658d \| title = Structures and Energies of Various Isomers of Dithionous Acid, H2S2O4, and of Its Anion HS2O4- 1 \| year = 1998 \| last1 = Drozdova \| first1 = Yana \| last2 = Steudel \| first2 = Ralf \| last3 = Hertwig \| first3 = Roland H. \| last4 = Koch \| first4 = Wolfram \| last5 = Steiger \| first5 = Thomas \| journal = The Journal of Physical Chemistry A \| volume = 102 \| issue = 6 \| pages = 990–996 \| bibcode = 1998JPCA..102..990D}}</ref> It is the ] of the ] dianion, S<sub>2</sub>O<sub>4</sub><sup>2-</sup>. Dithionite is a well-known reducing agent.

	==~~See~~ ~~also~~==		==Related compounds==
			*] (H<sub>2</sub>S<sub>2</sub>O<sub>6</sub>), another unstable protonated sulfur oxide, derived from dithionate.
	* ]
	* ]

	==References==		==References==
	{{reflist}}		{{reflist}}

		⚫	]

⚫	{{inorganic-compound-stub}}

⚫	]
	]		]


	]
		⚫	{{inorganic-compound-stub}}

Latest revision as of 18:00, 9 July 2024

Dithionous acid

Names

IUPAC name Dithionous acid

Other names Hydrosulfurous acid; Hyposulfurous acid

Identifiers

CAS Number

15959-26-9

3D model (JSmol)

Interactive image

ChEBI

CHEBI:29253

ChemSpider

22898

PubChem CID

24490

CompTox Dashboard (EPA)

DTXSID70274771

InChI

InChI=1S/H2O4S2/c1-5(2)6(3)4/h(H,1,2)(H,3,4)Key: GRWZHXKQBITJKP-UHFFFAOYSA-N
InChI=1/H2O4S2/c1-5(2)6(3)4/h(H,1,2)(H,3,4)Key: GRWZHXKQBITJKP-UHFFFAOYAX

SMILES

O=S(O)S(=O)O

Properties

Chemical formula

H₂S₂O₄

Molar mass

130.144 g/mol

Acidity (pK_a)

0.35, 2.45

Conjugate base

Dithionite

Related compounds

Oxalic acid
Sodium dithionite
Potassium dithionite

Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa).

Y verify (what is ?) Infobox references

Chemical compound

Dithionous acid is a sulfur oxoacid with the chemical formula H₂S₂O₄. It has not been observed experimentally. It is the conjugate base of the dithionite dianion, S₂O₄. Dithionite is a well-known reducing agent.

Related compounds

Dithionic acid (H₂S₂O₆), another unstable protonated sulfur oxide, derived from dithionate.

References

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.
Drozdova, 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.

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