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Properties of substance:
sodium metaborate
Group of substances:
inorganic
Physical appearance:
colorless trigonal crystals
Empirical formula (Hill's system for organic substances):
B
3
Na
3
O
6
Structural formula as text:
Na3B3O6
Melting point (°C):
966
Boiling point (°C):
1434
Solubility (g/100 g of solvent):
diethyl ether
: insoluble [
Ref.
]
ethanol
: insoluble [
Ref.
]
water
: 16.9 (0°C) [
Ref.
]
water
: 20.8 (10°C) [
Ref.
]
water
: 25.3 (20°C) [
Ref.
]
water
: 28.2 (25°C) [
Ref.
]
water
: 31.4 (30°C) [
Ref.
]
water
: 40.35 (40°C) [
Ref.
]
water
: 63.9 (60°C) [
Ref.
]
water
: 84.5 (80°C) [
Ref.
]
water
: 125.2 (100°C) [
Ref.
]
Density:
2.4 (20°C, g/cm
3
)
Surface tension (mN/m):
193 (1020°C)
180 (1100°C)
164 (1200°C)
131 (1400°C)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-1059 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
73.39 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
65.94 (s)
References:
Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 10 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 83 [Russian]
Уэллс А. Структурная неорганическая химия. - Т. 3. - М.: Мир, 1987. - pp. 193-194 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru