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Disodium hydrogen arsenate

Chemical compound From Wikipedia, the free encyclopedia

Disodium hydrogen arsenate
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Disodium hydrogen arsenate is the inorganic compound with the formula Na2HAsO4.7H2O. The compound consists of a salt and seven molecules of water of crystallization although for simplicity the formula usually omits the water component. The other sodium arsenates are NaH2AsO4 and Na3AsO4, the latter being called sodium arsenate. Disodium hydrogen arsenate is highly toxic. The salt is the conjugate base of arsenic acid. It is a white, water-soluble solid.[1]

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Being a diprotic acid, its acid-base properties is described by two equilibria:

H
2
AsO
4
+ H2O HAsO2−
4
+ H3O+  (pKa2 = 6.94)
HAsO2−
4
+ H2O AsO3−
4
+ H3O+  (pKa3 = 11.5)
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