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Properties of substance:
selenic acid
Group of substances:
inorganic
Physical appearance:
colorless hexagonal crystals
Empirical formula (Hill's system for organic substances):
H
2
O
4
Se
Structural formula as text:
H2SeO4
Molar/atomic mass: 144.97
Melting point (°C):
62
Decomposition temperature (°C):
260
Solubility (g/100 g of solvent):
ammonia liquid
: insoluble [
Ref.
]
sulfuric acid
: soluble [
Ref.
]
water
: 566 (20°C) [
Ref.
]
water
: 1720 (40°C) [
Ref.
]
water
: miscible (60°C) [
Ref.
]
Properties of solutions:
49,4% (wt.), solvent - water
Freezing point (°C) = -83.4
80% (wt.), solvent - water
Density (g/cm
3
) = 2.122 (20°)
Hygroscopic:
yes
Density:
2.95 (15°C, g/cm
3
)
Electrode potential:
SeO
4
2-
+ 4H
+
+ 2e
-
→ H
2
SeO
3
+ H
2
O, E = 1.15 V (water, °C)
Dissociation:
pK
a
(1) = -3 (25°C, water)
pK
a
(2) = 1.9 (25°C, water)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-532.6 (s)
References:
Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 601
Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 190-191 [Russian]
Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 362 [Russian]
Редкие и рассеянные элементы. Химия и технология. - Кн. 3. - М.: Мисис, 2003. - pp. 244-246 [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]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru