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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):

B3Na3O6

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/cm3)

Surface tension (mN/m):

193 (1020°C)
180 (1100°C)
164 (1200°C)
131 (1400°C)

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-1059 (s)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

73.39 (s)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

65.94 (s)

References:

  1. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 10 [Russian]
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 83 [Russian]
  3. 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