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1327-52-2O=[As](O)(O)ODJHGAFSJWGLOIV-UHFFFAOYSA-N1327-52-2Sicherheitsangaben dienen nur zur Orientierung und ersetzen weder das Sicherheitsdatenblatt (SDB) des Lieferanten noch geltende Vorschriften oder eine fachliche Bewertung.
BeschreibungArsenic acid has the molecular formula H3AsO4. More descriptively written as AsO(OH)3, this colorless acid is the arsenic analog of phosphoric acid. 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. Arsenic acid is a tetrahedral species of idealized symmetry C3v with As—O bonds lengths ranging from 1.66 to 1.71 . Being a triprotic acid, its acidity is described by three equilibria: H3AsO4 H2AsO4- + H+ (pk1 =10-2.19) H2AsO4 5HasO4 2- + H+ (pk2 = 10-6.94) HasO4 2 5AsO4 3- + H+ (pk3 = 10-11.5)
synthetischeArsenic acid is prepared by treating arsenic trioxide with concentrated nitric acid or by combination of arsenic acid with water. The latter reaction is very slow. It is also formed when metaarsenic or pyroarsenic acid is treated with cold water.
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