Arsenic acid Chemische Eigenschaften,Einsatz,Produktion Methoden
Beschreibung
Arsenic 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)
synthetische
Arsenic 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.
Arsenic acid Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
