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Properties of substance:
lead(IV) oxide α-form
Synonyms:
lead dioxide α-form
Group of substances:
inorganic
Physical appearance:
rhombic crystals
Empirical formula (Hill's system for organic substances):
O
2
Pb
Structural formula as text:
PbO2
Molar/atomic mass: 239.2
Decomposition temperature (°C):
220
Solubility (g/100 g of solvent):
ethanol
: insoluble [
Ref.
]
hydrogen fluoride
: insoluble [
Ref.
]
sulfuric acid
: insoluble [
Ref.
]
water
: insoluble [
Ref.
]
Density:
9.67 (20°C, g/cm
3
)
Reactions of synthesis:
[
Ref.1
]
2Pb(CH
3
COO)
2
+ Ca(ClO)
2
+ 4NaOH → 2PbO
2
+ CaCl
2
+ 4CH
3
COONa + 2H
2
O
Electrode potential:
PbO
2
+ 4H
+
+ 2e
-
→ Pb
2+
+ 2H
2
O, E = 1.449 V (water, 25°C)
PbO
2
+ SO
4
2-
+ 4H
+
+ 2e
-
→ PbSO
4
+ 2H
2
O, E = 1.685 V (water, 25°C)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-276 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
71.92 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
61 (s)
References:
Inorganic Syntheses. - Vol. 1. - New York and London, 1939. - pp. 45-47
Джафаров Э.А. Электроосаждение, свойства и применение двуокиси свинца. - Баку: ИАН Азербаджанской ССР, 1967 [Russian]
Полянский Н.Г. Свинец. - М.: Наука, 1986. - pp. 22 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 95 [Russian]
Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 304 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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