Arsonic acid

Arsonic acid
Names
	Preferred IUPAC name Arsonic acid
Identifiers
CAS Number	36465-76-6;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:29850;
ChemSpider	140865;
PubChem CID	5491620;
UNII	BZ0G20838B;
CompTox Dashboard (EPA)	DTXSID5058515 ;
	InChI InChI=1S/AsH2O3/c2-1(3)4/h(H2,2,3,4) Key: MJJNNUVOCYXPBG-UHFFFAOYSA-N;
	SMILES O[AsH](=O)O;
Properties
Chemical formula	AsH3O3
Molar mass	125.943 g·mol−1
Conjugate base	Hydrogen arsonate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Arsenous acid (As(OH)₃) is the stable tautomer of H₃AsO₃.^[2]

Phosphorous acid (also called phosphonic acid) exists as the pentavalent tautomer, in contrast to H₃AsO₃.

Arsonic acid is the simplest of the arsonic acids. It is a hypothetical compound, although the tautomeric arsenious acid (As(OH)₃) is well established. In contrast to the instability of HAsO(OH)₂, the phosphorus compound with analogous stoichiometry exists as the tetrahedral tautomer. Similarly, organic derivatives such as phenylarsonic acid are tetrahedral with pentavalent central atom.^[3]

There are similar acids that are the same except for having different pnictogens. The phosphorus equivalent is phosphonic acid.

References

^ Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 916. doi:10.1039/9781849733069-00648. ISBN 978-0-85404-182-4.
^ Munoz-Hernandez, M.-A. (1994). "Arsenic: Inorganic Chemistry". In King, R. B. (ed.). Encyclopedia of Inorganic Chemistry. Chichester: John Wiley & Sons.
^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

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[iupac2013-1] Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 916. doi:10.1039/9781849733069-00648. ISBN 978-0-85404-182-4.

[2] Munoz-Hernandez, M.-A. (1994). "Arsenic: Inorganic Chemistry". In King, R. B. (ed.). Encyclopedia of Inorganic Chemistry. Chichester: John Wiley & Sons.

[3] Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

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