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Properties of substance:
sodium pyrophosphate
Group of substances:
inorganic
Physical appearance:
colorless rhombic crystals
Empirical formula (Hill's system for organic substances):
Na
4
O
7
P
2
Structural formula as text:
Na4P2O7
Molar/atomic mass: 265.9
Melting point (°C):
880
Solubility (g/100 g of solvent):
ethylene glycol
: soluble with solvolysis [
Ref.
]
ethylene glycol monomethyl ether
: 0.456 (25°C) [
Ref.
]
ethylene glycol monomethyl ether
: 0.677 (35°C) [
Ref.
]
glycerol
: 1.212 (25°C) [
Ref.
]
glycerol
: 1.407 (35°C) [
Ref.
]
water
: 2.29 (0°C) [
Ref.
]
water
: 5.5 (20°C) [
Ref.
]
water
: 7.09 (25°C) [
Ref.
]
water
: 7.57 (30°C) [
Ref.
]
water
: 16.3 (50°C) [
Ref.
]
water
: 24.6 (60°C) [
Ref.
]
water
: 54.2 (82°C) [
Ref.
]
water
: 45.2 (96°C) [
Ref.
]
Density:
2.37 (20°C, g/cm
3
)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-3166 (s)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
-3001 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
270 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
241 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
59
References:
CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-91
Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1291-1292
Гринвуд Н., Эрншо А. Химия элементов. - Т.1. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 491 [Russian]
Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 168-169 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 86 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru