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EC number: 231-901-9
CAS number: 7778-39-4
The dissociation constant of arsenic acid was considered to be pKa 1= 2.22, pKa 2 = 6.98 and pKa 3 = 11.53.
provide pKa values for arsenic acid. Using a weight of evidence, the key
value for the dissociation constant of arsenic acid on the different
equilibrium in water was concluded using ATSDR (2007) report:
H3AsO4 <-> H+ +
1 = 2.22
H2AsO4- <-> H+ +
2 = 6.98
HAsO42- <-> H+ +
pKa 3 = 11.53
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