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Properties of substance:
potassium persulfate
Synonyms:
potassium peroxydisulfate
Group of substances:
inorganic
Physical appearance:
colorless triclinic crystals
Empirical formula (Hill's system for organic substances):
K
2
O
8
S
2
Structural formula as text:
K2S2O8
Molar/atomic mass: 270.31
Decomposition temperature (°C):
200
Solubility (g/100 g of solvent):
ethanol
: insoluble [
Ref.
]
hydrogen fluoride
: very soluble [
Ref.
]
water
: 1.7 (0°C) [
Ref.
]
water
: 2.9 (10°C) [
Ref.
]
water
: 4.8 (20°C) [
Ref.
]
water
: 6.1 (25°C) [
Ref.
]
water
: 7.6 (30°C) [
Ref.
]
water
: 11.4 (40°C) [
Ref.
]
water
: 16.8 (50°C) [
Ref.
]
Density:
2.48 (20°C, g/cm
3
)
Reactions:
[
Ref.1
]
2K
2
S
2
O
8
→ 2K
2
S
2
O
7
+ O
2
[
Ref.1
]
5K
2
S
2
O
8
+ 2MnSO
4
+ 8H
2
O → 2KMnO
4
+ 8H
2
SO
4
+ 4K
2
SO
4
[
Ref.1
]
NaIO
3
+ 4NaOH + K
2
S
2
O
8
→ Na
3
H
3
IO
6
+ K
2
SO
4
+ Na
2
SO
4
+ H
2
O
Refractive index (n
D
):
1.461 (20°C)
Electrode potential:
S
2
O
8
2-
+ 2e
-
→ 2SO
4
2-
, E = 2.01 V (water, 25°C)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-1918 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
278.7 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
213.1 (s)
LD
50
(mg/kg):
1650 (white rats, oral)
1250 (white mice, oral)
References:
Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 130-131 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 69 [Russian]
Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 84-85 [Russian]
Токсикологический вестник. - 2003. - №2. - pp. 34 [Russian]
Успехи химии. - 1965. - Т.34, №12. - pp. 2119-2120 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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