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Properties of substance:
potassium manganate(VI)
Group of substances:
inorganic
Physical appearance:
green rhombic crystals
Empirical formula (Hill's system for organic substances):
K
2
MnO
4
Structural formula as text:
K2MnO4
Molar/atomic mass: 197.13
Decomposition temperature (°C):
500
Solubility (g/100 g of solvent):
water
: reaction [
Ref.
]
Reactions of synthesis:
Yeild 60%. [
Ref.1
]
2MnO
2
+ 4KOH + O
2
→ 2K
2
MnO
4
+ 2H
2
O
[
Ref.1
,
Ref.2
]
4KMnO
4
+ 4KOH → 4K
2
MnO
4
+ 2H
2
O + O
2
Reactions:
[
Ref.1
]
2K
2
MnO
4
→ 2K
2
MnO
3
+ O
2
Electrode potential:
MnO
4
2-
+ 4H
+
+ 2e
-
→ MnO
2
+ 2H
2
O, E = 2.257 V (water, 25°C)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-1180 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
147 (s)
References:
CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-83
Лидин Р.А., Андреева Л.Л., Молочко В.А. Константы неорганических веществ. - М.: Дрофа, 2006. - pp. 121 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 68 [Russian]
Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 643 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru