3D model (JSmol)
|Molar mass||125.94 g/mol|
|Appearance||Only exists in aqueous solutions|
|Main hazards||Toxic, corrosive|
|US health exposure limits (NIOSH):|
|[1910.1018] TWA 0.010 mg/m3|
|Ca C 0.002 mg/m3 [15-minute]|
IDLH (Immediate danger)
|Ca [5 mg/m3 (as As)]|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Arsenous acid (or arsenious acid) is the inorganic compound with the formula H3AsO3. It is known to occur in aqueous solutions, but it has not been isolated as a pure material, although this fact does not detract from the significance of As(OH)3.
As(OH)3 is a pyramidal molecule consisting of three hydroxyl groups bonded to arsenic. The 1H NMR spectrum of arsenous acid solutions consists of a single signal consistent with the molecule's high symmetry. In contrast, the nominally related phosphorus species H3PO3 mainly adopts the structure HPO(OH)2; P(OH)3 is a very minor equilibrium component of such solutions. The differing behaviors of the As and P compounds reflect a trend whereby high oxidation states are more stable for lighter members of main group elements than their heavier congeners.
One tautomer of arsenous acid is HAsO(OH)2, which is called arsonic acid. It has not been isolated or well-characterized.
Like arsenic trioxide, arsenous acid is sometimes amphoteric. For example, it reacts with hydrochloric, hydrobromic, and hydroiodic acids to produce arsenic trichloride, tribromide, and triiodide.
- As(OH)3 + 3 HCl ⇌ AsCl3 + 3 H2O
- As(OH)3 + 3 HBr ⇌ AsBr3 + 3 H2O
- As(OH)3 + 3 HI ⇌ AsI3 + 3 H2O
- As(OH)3 + CH3I + NaOH ⇌ CH3AsO(OH)2 + NaI + H2O
Alkylation occurs at As, and the oxidation state of As increases from III to V.
- "NIOSH Pocket Guide to Chemical Hazards #0038". National Institute for Occupational Safety and Health (NIOSH).
- Munoz-Hernandez, M.-A. (1994). "Arsenic: Inorganic Chemistry". In King, R. B. Encyclopedia of Inorganic Chemistry. Chichester: John Wiley & Sons.
- Kolozsi, A.; Lakatos, A.; Galbács, G.; Madsen, A. Ø.; Larsen, E.; Gyurcsik, B. (2008). "A pH-Metric, UV, NMR, and X-ray Crystallographic Study on Arsenous Acid Reacting with Dithioerythritol" (pdf). Inorganic Chemistry. 47: 3832–3840. doi:10.1021/ic7024439. PMID 18380458.
- Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9.
- G. Meyer (1883). "Ueber einige anomale Reaktionen". Berichte der deutschen chemischen Gesellschaft. 13: 1439–1443. doi:10.1002/cber.188301601316.
- "Arsenic trioxide". Retrieved January 29, 2006.