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Properties of substance:
sodium chromate
Group of substances:
inorganic
Physical appearance:
yellow rhombic crystals
Empirical formula (Hill's system for organic substances):
CrNa
2
O
4
Structural formula as text:
Na2CrO4
Molar/atomic mass: 161.97
Melting point (°C):
794
Solubility (g/100 g of solvent):
ammonia liquid
: insoluble [
Ref.
]
chromyl chloride
: insoluble [
Ref.
]
ethanol
: sparingly soluble [
Ref.
]
methanol
: 0.345 (25°C) [
Ref.
]
water
: 31.4 (0°C) [
Ref.
]
water
: 48.2 (10°C) [
Ref.
]
water
: 76.6 (20°C) [
Ref.
]
water
: 84.5 (25°C) [
Ref.
]
water
: 95.3 (40°C) [
Ref.
]
water
: 115.1 (60°C) [
Ref.
]
water
: 122.2 (80°C) [
Ref.
]
water
: 126.7 (100°C) [
Ref.
]
water
: 133 (150°C) [
Ref.
]
Density:
2.72 (20°C, g/cm
3
)
Reactions of synthesis:
[
Ref.1
,
Ref.2
]
4Fe(CrO
2
)
2
+ 8Na
2
CO
3
+ 7O
2
→ 8Na
2
CrO
4
+ 2Fe
2
O
3
+ 8CO
2
Reactions:
Yeild 83%. [
Ref.1
]
2Na
2
CrO
4
+ 2CO
2
+ H
2
O → Na
2
Cr
2
O
7
+ 2NaHCO
3
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-1333 (s)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
-1232 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
174.5 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
142.1 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
24.7
References:
Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1255-1257
Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 170-171 [Russian]
Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 372 [Russian]
Неорганические соединения хрома: Справочник. - Л.: Химия, 1981. - pp. 122 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 86 [Russian]
Рипан Р., Четяну И. Неорганическая химия. - Т.2. - М.: Мир, 1972. - pp. 265 [Russian]
Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 131, 671 [Russian]
Химическая технология неорганических веществ. - Кн.2, под ред. Ахметова Т.Г. - М.: Высшая школа, 2002. - pp. 147-148 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru