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Properties of substance:
sodium sulfite
Synonyms:
sodium sulphite
Group of substances:
inorganic
Physical appearance:
colorless hexagonal crystals
Empirical formula (Hill's system for organic substances):
Na
2
O
3
S
Structural formula as text:
Na2SO3
Molar/atomic mass: 126.04
Melting point (°C):
911
Decomposition temperature (°C):
700
Solubility (g/100 g of solvent):
ammonia liquid
: 0.17 (25°C) [
Ref.
]
benzonitrile
: insoluble [
Ref.
]
ethanol
: sparingly soluble [
Ref.
]
ethyl acetate
: insoluble [
Ref.
]
methyl acetate
: insoluble [
Ref.
]
sulfur dioxide
: 0.023 (0°C) [
Ref.
]
water
: 14.4 (0°C) [
Ref.
]
water
: 26.1 (20°C) [
Ref.
]
water
: 37.4 (40°C) [
Ref.
]
water
: 33.2 (60°C) [
Ref.
]
water
: 29 (80°C) [
Ref.
]
water
: 26.6 (100°C) [
Ref.
]
Density:
2.633 (15°C, g/cm
3
)
Reactions:
[
Ref.1
]
2CuCl
2
+ Na
2
SO
3
+ H
2
O → 2CuCl + Na
2
SO
4
+ 2HCl
[
Ref.1
]
3CuSO
4
+ 4Na
2
SO
3
+ 2H
2
O → Cu
2
SO
3
* CuSO
3
* 2H
2
O + 4Na
2
SO
4
+ SO
2
Electrode potential:
SO
4
2-
+ H
2
O + 2e
-
→ SO
3
2-
+ 2OH
-
, E = -0.93 V (water, 25°C)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-1090 (s)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
-1002 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
146 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
120.1 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
26
References:
Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1296-1298, 1300
Stern K.H. High temperature properties and thermal decomposition of inorganic salts with oxyanions. - CRC Press, 2001. - pp. 71
Zeitschrift fur anorganische und allgemeine Chemie. - 1924. - Vol. 139, No. 1. - pp. 275-280 [DOI:
10.1002/zaac.19241390116
]
Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 166-167 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 85 [Russian]
Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 365 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru