Product Name: Benzenearsonic acid (CAS NO.98-05-5)

Molecular Formula: C₆H₇AsO₃
Molecular Weight: 202.04g/mol
Mol File: 98-05-5.mol
Einecs: 202-631-9
Appearance: Colourless solid
Melting Point: 154–158 °C
Boiling point: 438.2 °C at 760 mmHg
Storage Temperature:
Flash Point: 232.9 °C
Density: 1,76 g/cm³
Enthalpy of Vaporization: 73.25 kJ/mol
Vapour Pressure: 1.88E-08 mmHg at 25°C
H-Bond Donor: 2
H-Bond Acceptor: 3
Structure Descriptors of Benzenearsonic acid (CAS NO.98-05-5):
  IUPAC Name: phenylarsonic acid
  Canonical SMILES: C1=CC=C(C=C1)[As](=O)(O)O
  InChI: InChI=1S/C6H7AsO3/c8-7(9,10)6-4-2-1-3-5-6/h1-5H,(H2,8,9,10) 
  InChIKey: LVKZSFMYNWRPJX-UHFFFAOYSA-N
Product Categories: Organometallics; As (Arsenic) Compounds; Classes of Metal Compounds; Semimetal Compounds

Several derivatives of Benzenearsonic acid (CAS NO.98-05-5) have been used as additives for animal feeds. These include 4-hydroxy-3-nitrobenzenearsonic acid (3-NHPAA, or Roxarsone), p-arsanilic acid (p-ASA), 4-nitrophenylarsonic acid (4-NPAA), and p-ureidophenylarsonic acid (p-UPAA).

PhAsO₃H₂ can be prepared in several routes, but a common one entails treatment of phenyl diazonium salts with sodium arsenite (prepared from arsenious acid and base) in the presence of a copper(II) catalyst.
C₆H₅N₂⁺ + NaAsO₃H₂ → C₆H₅AsO₃H₂ + Na+ + N₂
Related derivatives are prepared similarly. It was first prepared by Michaelis and Loenser.X-ray crystallography indicates that the molecules are connected by hydrogen-bonds consistent with short distance of 2.5 Å separating the oxygen atoms. The arsenic center is tetrahedral.

Reported in EPA TSCA Inventory. EPA Extremely Hazardous Substances List. Arsenic and its compounds are on the Community Right-To-Know List.

A deadly poison by ingestion and intravenous routes. See also ARSENIC COMPOUNDS. When heated to decomposition it emits toxic fumes of As.
Safety Information of Benzenearsonic acid (CAS NO.98-05-5):
Hazard Codes: N-T
Risk Statements: 50/53-23/25
23:  Toxic by inhalation 
25:  Toxic if swallowed 
50:  Very Toxic to aquatic organisms 
53:  May cause long-term adverse effects in the aquatic environment 
Safety Statements: 61-60-45-28A-20/21
21:  When using, do not smoke 
22:  Do not breathe dust 
28:  After contact with skin, wash immediately with plenty of ... (to be specified by the manufacturer) 
45:  In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) 
60:  This material and/or its container must be disposed of as hazardous waste 
61:  Avoid release to the environment. Refer to special instructions safety data sheet 

OSHA PEL: TWA 0.5 mg/(As)m³
ACGIH TLV: BEI: 35 μ (As)/L inorganic arsenic and methylated metabolites in urine

 Benzenearsonic acid ,its CAS NO. is 98-05-5,the synonyms is Arsonic acid, phenyl- ; BRN 2935741 ; EINECS 202-631-9 ; HSDB 6381 ; Kyselina benzenarsonova ; Monophenylarsonic acid ; NSC 15566 ; Phenylarsonic acid .