Arsenic acid
IUPAC name	Arsenic acid, arsoric acid
Other names	Arsenic acid orthoarsenic acid desiccant L-10 zotox
Identifiers
CAS number	[7778-39-4]
RTECS number	CG0700000
Properties
Molecular formula	H3AsO4 (Solution Only) H3AsO4·1⁄2H2O (Stable Form)
Molar mass	141. IUPAC Nomenclature is a system of naming Chemical compounds and of describing the science of Chemistry in general CAS registry numbers are unique numerical identifiers for Chemical compounds Polymers biological sequences mixtures and Alloys They are also referred to Registry of Toxic Effects of Chemical Substances ( RTECS) is a Database of Toxicity information compiled from the open scientific literature without reference A chemical formula is a way of expressing information about the Atoms that constitute a particular Chemical compound, and how the relationship between those atoms changes Molar mass, symbol M, is the Mass of one mole of a substance ( Chemical element or Chemical compound) 9429 g/mol
Appearance	White translucent crystals, hygroscopic. Hygroscopy is the ability of a substance to attract Water Molecules from the surrounding environment through either absorption or Adsorption
Density	? g/cm3, solid
Melting point	35. The density of a material is defined as its Mass per unit Volume: \rho = \frac{m}{V} Different materials usually have different The melting point of a solid is the temperature range at which it changes state from solid to Liquid. 5 °C (308. 65 K)
Boiling point	decom ≥ 100 °C
Solubility in water	16. The boiling point of a liquid is the temperature at which the Vapor pressure of the liquid equals the environmental pressure surrounding the liquid Solubility is the characteristic Physical property referring to the ability of a given substance the Solute, to dissolve in a Solvent. Water is a common Chemical substance that is essential for the survival of all known forms of Life. 7 g/100 mL
Acidity (pKa)	2. 19, 6. 94, 11. 5
Structure
Molecular shape	Tetrahedral
Hazards
Main hazards	Toxic. Molecular geometry or molecular structure is the three- Dimensional arrangement of the Atoms that constitute a Molecule. Occupational safety and health is a cross-disciplinary area concerned with protecting the Safety, Health and welfare of people engaged in
R-phrases	R26, R27, R28, R45. R-phrases (short for Risk Phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous R-phrases (short for Risk Phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous R-phrases (short for Risk Phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous R-phrases (short for Risk Phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous R-phrases (short for Risk Phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous
S-phrases	S53, S45, S60, S61. S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning dangerous substances and preparations. S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning dangerous substances and preparations. S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning dangerous substances and preparations. S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning dangerous substances and preparations. S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning dangerous substances and preparations.
Flash point	Non-flammable. The flash point of a flammable liquid is the lowest Temperature at which it can form an ignitable mixture in air
Related compounds
Other anions	Phosphoric acid
Other cations	Sodium arsenate
Related compounds	Arsenous acid Arsenic pentoxide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Arsenic acid is the chemical compound with the formula H₃AsO₄. An ion is an Atom or Molecule which has lost or gained one or more Valence electrons giving it a positive or negative electrical charge Phosphoric acid, also known as orthophosphoric acid or phosphoric(V acid, is a mineral (inorganic acid having the Chemical formula An ion is an Atom or Molecule which has lost or gained one or more Valence electrons giving it a positive or negative electrical charge Arsenous acid, also known as arsenious acid, is the Hydrolyzed form of Arsenic trioxide and has the formula As(OH3 Arsenic pentoxide, As2O5 is an important commercial compound of Arsenic. In Chemistry, the standard state of a material is its state at 1 bar (100 Kilopascals exactly A chemical compound is a substance consisting of two or more different elements chemically bonded together in a fixed proportion by Mass. A chemical formula is a way of expressing information about the Atoms that constitute a particular Chemical compound, and how the relationship between those atoms changes More descriptively written as AsO(OH)₃, this colorless acid is the arsenic analogue of phosphoric acid. In Computer science, ACID ( Atomicity Consistency Isolation Durability) is a set of properties that guarantee that Database transactions are Phosphoric acid, also known as orthophosphoric acid or phosphoric(V acid, is a mineral (inorganic acid having the Chemical formula Arsenate and phosphate salts behave very similarly. Arsenic acid as such has not been isolated, but only found in solution where it is largely ionized. Its hemihydrate form (H₃AsO₄·1⁄2H₂O) does form stable crystals. Crystalline samples dehydrate with condensation at 100 °C. ^[1]

It is a tetrahedral species of idealized symmetry C_3v with As-O bonds lengths ranging from 1. The Symmetry group of an object ( Image, signal, etc eg in 1D 2D or 3D is the group of all Isometries under which it is 66-1. 71Å. ^[2]

Being a triprotic acid, its acidity is described by three equilibria:

H₃AsO₄ H₂AsO₄^- + H⁺, K₁ = 10^{-2. In Computer science, ACID ( Atomicity Consistency Isolation Durability) is a set of properties that guarantee that Database transactions are 19}

H₂AsO₄^- HAsO₄^2- + H⁺, K₂ = 10^{-6. 94}

HAsO₄^2- AsO₄^3- + H⁺, K₃ = 10^{-11. 5}

These K_a's are close to those for phosphoric acid. The highly basic arsenate ion, AsO₄^3-, is the product of the third ionization. The arsenate Ion is As[[Oxygen O]]43&minusAn arsenate (compound is any compound that contains this ion Unlike phosphoric acid, arsenic acid is oxidizing, illustrated by its ability to convert iodide to iodine. An iodide Ion is an iodine atom with a &minus1 charge. Compounds with iodine in formal Oxidation state &minus1 are called iodides Iodine (ˈaɪədaɪn ˈaɪədɪn or /ˈaɪədiːn/ from ιώδης iodes "violet" is a Chemical element that has the symbol I and Atomic

Applications

Commercial applications of arsenic acid are limited by its toxicity. It has found occasional use as a wood preservative, broad-spectrum biocide, a finishing agent for glass and metal, and a reagent in the retard of some dyestuffs and organic arsenic compounds. Lumber or timber is Wood in any of its stages from felling through readiness for use as structural Material for Construction, or A reagent or reactant is a substance or compound consumed during a Chemical reaction. A dye can generally be described as a Colored substance that has an affinity to the substrate to which it is being applied

Historic Use

Atoxyl was first synthesized in 1859 by Antoine Béchamp by chemically reacting arsenic acid with aniline. Year 1859 ( MDCCCLIX) was a Common year starting on Saturday (link will display the full calendar of the Gregorian calendar (or a Common Pierre Jacques Antoine Béchamp was a French biologist. He studied silkworm parasites and was the first to synthesise Atoxyl. Aniline, phenylamine or aminobenzene is an Organic compound with the formula C6H7N Béchamp optimistically chose the name Atoxyl, referring to the reduced toxicity of the resulting compound (compared to arsenic). Atoxyl was initially used in medicine to treat simple skin diseases. In Medicine, a dermatosis is a generic term for disease of the skin. In 1905, two British physicians, H. Year 1905 ( MCMV) was a Common year starting on Sunday (link will display full calendar of the Gregorian calendar (or a Common year starting W. Thomas and A. Breinl, discovered that Atoxyl was active against the trypanosomes of sleeping sickness. Sleeping sickness or human African trypanosomiasis is a Parasitic Disease of people and animals caused by Protozoa of species However, the effect of atoxyl was not very pronounced, and the effective dose was so high that its toxic side effects far outweighed the benefits. Toxicity is the degree to which a substance is able to damage an exposed organism In 1909, Paul Ehrlich and Sahachiro Hata used Atoxyl as the basis to create Salvarsan, another arsenical used as an anti-syphiltic drug. Paul Ehrlich ( March 14, 1854 &ndash August 20, 1915) was a German Scientist who won the 1908 Nobel ( 23 March 1873 – 22 November 1938) was a Japanese Bacteriologist who developed the Arsphenamine drug in Arsphenamine, also known as Salvarsan and 606, is a drug that was used to treat Syphilis and trypanosomiasis.

References

1. ^ Holleman, A. F. ; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
2. ^ Lee, C. ; Harrison, W. T. A. "Tetraethylammonium dihydrogenarsenate bis(arsenic acid) and 1,4-diazoniabicyclo[2. 2. 2]octane bis(dihydrogenarsenate) arsenic acid: hydrogen-bonded networks containing dihydrogenarsenate anions and neutral arsenic acid molecules" Acta Crystallographica (2007). C63, m308-m311. doi=10. 1107/S0108270107023967.

© 2009 citizendia.org; parts available under the terms of GNU Free Documentation License, from http://en.wikipedia.org
Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic