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Properties of substance:
potassium sulfide
Group of substances:
inorganic
Physical appearance:
colorless cubic crystals
Empirical formula (Hill's system for organic substances):
K
2
S
Structural formula as text:
K2S
Molar/atomic mass: 110.26
Melting point (°C):
471
Solubility (g/100 g of solvent):
acetone
: insoluble [
Ref.
]
ammonia liquid
: moderately soluble [
Ref.
]
diethyl ether
: insoluble [
Ref.
]
ethanol
: soluble [
Ref.
]
ethyl acetate
: insoluble [
Ref.
]
glycerol
: 10 (20°C) [
Ref.
]
methyl acetate
: insoluble [
Ref.
]
water
: soluble [
Ref.
]
Hygroscopic:
yes
Density:
1.8 (20°C, g/cm
3
)
Reactions:
[
Ref.1
]
K
2
S + 3S → K
2
S
4
Standard molar enthalpy (heat) of formation Δ
f
H (298 K, kJ/mol)
-380.7 (s) [
Ref.
]
-346.5 (l) [
Ref.
]
Standard molar Gibbs energy of formation Δ
f
G (298 K, kJ/mol)
-364 (s) [
Ref.
]
Standard molar entropy S (298 K, J/(mol·K))
105 (s) [
Ref.
]
141.2 (l) [
Ref.
]
Molar heat capacity at constant pressure C
p
(298 K, J/(mol·K))
74.7 (l) [
Ref.
]
References:
CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 4-83
Comey A. M., Hahn D. A. A dictionary of Chemical Solubilities Inorganic. - 2 ed. - New York, The MacMillan Company, 1921. - pp. 769
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 69 [Russian]
Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 289 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru