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Properties of substance:
selenious acid
Group of substances:
inorganic
Physical appearance:
colorless hexagonal crystals
Empirical formula (Hill's system for organic substances):
H
2
O
3
Se
Structural formula as text:
H2SeO3
Molar/atomic mass: 128.97
Decomposition temperature (°C):
70
Solubility (g/100 g of solvent):
ammonia liquid
: insoluble [
Ref.
]
ethanol
: very soluble [
Ref.
]
water
: 167 (20°C) [
Ref.
]
water
: 385 (90°C) [
Ref.
]
Density:
3.004 (15°C, g/cm
3
)
Reactions:
[
Ref.1
,
Ref.2
]
H
2
SeO
3
+ 2SO
2
+ H
2
O → Se + 2H
2
SO
4
Electrode potential:
H
2
SeO
3
+ 4H
+
+ 4e
-
→ Se + 3H
2
O, E = 0.741 V (water, 25°C)
Dissociation:
pK
a
(1) = 2.46 (25°C, water)
pK
a
(2) = 7.3 (25°C, water)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-525 (s)
LD
50
(mg/kg):
11 (mice, intravenous)
References:
Lewis R.J. Sax's Dangerous Properties of Industrial Materials. - 12ed., Vol. 1-5. - Wiley, 2012. - pp. 3940-3941
Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 601
Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 360 [Russian]
Реми Г. Курс неорганической химии. - Т.1. - М., 1963. - pp. 801-802 [Russian]
Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 342 [Russian]
Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 200-201 [Russian]
Справочник химика. - Т. 3. - М.-Л.: Химия, 1965. - pp. 79 [Russian]
Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 520 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru