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Properties of substance:
iron(III) hydroxide
Group of substances:
inorganic
Physical appearance:
brown cubic crystals
Empirical formula (Hill's system for organic substances):
H
3
FeO
3
Structural formula as text:
Fe(OH)3
Molar/atomic mass: 106.87
Decomposition temperature (°C):
500
Solubility (g/100 g of solvent):
diethyl ether
: insoluble [
Ref.
]
ethanol
: insoluble [
Ref.
]
water
: 0.0000151 [
Ref.
]
Density:
3.7 (20°C, g/cm
3
)
Reactions:
[
Ref.1
,
Ref.2
,
Ref.3
,
Ref.4
,
Ref.5
]
Fe
2
O
3
+ 3H
2
→ 2Fe + 3H
2
O
Electrode potential:
Fe(OH)
3
+ H
+
+ e
-
→ Fe(OH)
2
+ H
2
O, E = 0.271 V (water, 25°C)
Dissociation:
pK
b
(2) = 10.74 (25°C, water)
pK
b
(3) = 11.87 (25°C, water)
pK
sp
(0) = 37.42 (20°C, water)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-826.6 (s)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
-699.6 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
105 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
101.7 (s)
References:
Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 535
Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 116-117 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 63 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
, Ref.2, Ref.3, Ref.4, Ref.5]
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