Arsenic acid

Arsenic acid
Names
	IUPAC name Arsoric acid
	Other names Desiccant L-10; Orthoarsenic acid; Trihydrogen arsenate; Zotox;
Identifiers
CAS Number	7778-39-4 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:18231 ;
ChEMBL	ChEMBL2374288;
ChemSpider	229 ;
ECHA InfoCard	100.029.001
EC Number	231-901-9;
KEGG	C01478 ;
PubChem CID	234;
RTECS number	CG0700000;
UNII	N7CIZ75ZPN ;
UN number	1553, 1554
CompTox Dashboard (EPA)	DTXSID1034341 ;
	InChI InChI=1S/AsH3O4/c2-1(3,4)5/h(H3,2,3,4,5) Key: DJHGAFSJWGLOIV-UHFFFAOYSA-N ; InChI=1/AsH3O4/c2-1(3,4)5/h(H3,2,3,4,5) Key: DJHGAFSJWGLOIV-UHFFFAOYAY;
	SMILES O[As+](O)([O-])O;
Properties
Chemical formula	H3AsO4
Molar mass	141.942 g·mol−1
Appearance	White translucent or colorless crystals, hygroscopic
Density	2.5 g/cm3
Melting point	35.5 °C (95.9 °F; 308.6 K)
Boiling point	120 °C (248 °F; 393 K) decomposes
Solubility in water	16.7 g/(100 mL)
Solubility	soluble in ethanol
Vapor pressure	55 hPa (50 °C)
Acidity (pKa)	pKa1 = 2.19; pKa2 = 6.94; pKa3 = 11.5
Conjugate base	Arsenate
Structure
Molecular shape	Tetrahedral at arsenic atom
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Extremely toxic, carcinogenic, corrosive
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H312, H314, H331, H350, H361, H410
Precautionary statements	P201, P202, P260, P261, P264, P270, P271, P273, P280, P281, P301+P310, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P308+P313, P310, P311, P312, P321, P322, P330, P363, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)	4 0 0
Flash point	Non-flammable
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	48 mg/kg (rat, oral) 6 mg/kg (rabbit, oral)
Related compounds
Other cations	Sodium arsenate
Related compounds	Arsenous acid; Arsenic pentoxide; Phosphoric acid;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Arsenic acid or arsoric acid is the chemical compound with the formula H₃AsO₄. More descriptively written as AsO(OH)₃, this colorless acid is the arsenic analogue of phosphoric acid. Arsenate and phosphate salts behave very similarly. Arsenic acid as such has not been isolated, but is only found in solution, where it is largely ionized. Its hemihydrate form (2H₃AsO₄·H₂O) does form stable crystals. Crystalline samples dehydrate with condensation at 100 °C.

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