Arsonic acid

Arsonic acid
Names
Preferred IUPAC name
Arsonic acid[1]
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
UNII
  • InChI=1S/AsH2O3/c2-1(3)4/h(H2,2,3,4)
    Key: MJJNNUVOCYXPBG-UHFFFAOYSA-N
  • O[AsH](=O)O
Properties
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).
For the functional group, see Arsonic acid (functional group).
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.

  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.