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Properties of substance:
arsenic acid hemihydrate
Group of substances:
inorganic
Physical appearance:
colorless crystals
Empirical formula (Hill's system for organic substances):
H
8
As
2
O
9
Structural formula as text:
(H3AsO4)2 * H2O
Molar/atomic mass: 301.9
Melting point (°C):
35.5
Decomposition temperature (°C):
120
Solubility (g/100 g of solvent):
ethanol
: soluble [
Ref.
]
glycerol
: soluble [
Ref.
]
water
: soluble [
Ref.
]
Hygroscopic:
yes
Density:
2.5 (20°C, g/cm
3
)
Reactions:
Yeild 33%. [
Ref.1
,
Ref.2
,
Ref.3
,
Ref.4
,
Ref.5
]
C
6
H
5
OH + H
3
AsO
4
→ HOC
6
H
4
As(O)(OH)
2
+ H
2
O
HOC
6
H
4
As(O)(OH)
2
+ NaOH → HOC
6
H
4
As(O)(OH)(ONa) + H
2
O
Dissociation:
pK
a
(1) = 2.22 (25°C, water)
pK
a
(2) = 6.98 (25°C, water)
pK
a
(3) = 11.41 (18°C, water)
LD
50
(mg/kg):
6 (rabbits, intravenous)
References:
Lewis R.J. Sax's Dangerous Properties of Industrial Materials. - 11ed. - Wiley-interscience, 2004. - pp. 299
Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 112-113
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 83 [Russian]
Реми Г. Курс неорганической химии. - Т.1. - М., 1963. - pp. 706-708 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
, Ref.3
, Ref.4, Ref.5]
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, Ref.3, Ref.4, Ref.5]