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Properties of substance:
calcium hydroxide
Synonyms:
hydrated lime
Group of substances:
inorganic
Physical appearance:
colorless hexagonal crystals
Empirical formula (Hill's system for organic substances):
H
2
CaO
2
Structural formula as text:
Ca(OH)2
Molar/atomic mass: 74.08
Decomposition temperature (°C):
580
Solubility (g/100 g of solvent):
acetone
: insoluble [
Ref.
]
ammonia liquid
: insoluble [
Ref.
]
diethyl ether
: insoluble [
Ref.
]
ethanol
: insoluble [
Ref.
]
ethyl acetate
: insoluble [
Ref.
]
glycerol 35%
: 1.3 (25°C) [
Ref.
]
methyl acetate
: insoluble [
Ref.
]
water
: 0.176 (0°C) [
Ref.
]
water
: 0.17 (10°C) [
Ref.
]
water
: 0.16 (20°C) [
Ref.
]
water
: 0.155 (25°C) [
Ref.
]
water
: 0.148 (30°C) [
Ref.
]
water
: 0.137 (40°C) [
Ref.
]
water
: 0.114 (60°C) [
Ref.
]
water
: 0.092 (80°C) [
Ref.
]
water
: 0.072 (100°C) [
Ref.
]
water
: 0.035 (150°C) [
Ref.
]
water
: 0.012 (200°C) [
Ref.
]
Density:
2.34 (20°C, g/cm
3
)
Reactions:
[
Ref.1
]
Na
2
CO
3
+ Ca(OH)
2
→ 2NaOH + CaCO
3
Dissociation:
pK
b
(2) = 1.37 (25°C, water)
pK
sp
(0) = 5.26 (20°C, water)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-986.6 (s)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
-896.8 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
76.1 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
84.5 (s)
References:
Comey A. M., Hahn D. A. A dictionary of Chemical Solubilities Inorganic. - 2 ed. - New York, The MacMillan Company, 1921. - pp. 151-155
Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 309-318
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 71 [Russian]
Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 243-244 [Russian]
Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 92-93 [Russian]
Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 298 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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