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Properties of substance:

sodium tetraborate

Group of substances:

inorganic

Empirical formula (Hill's system for organic substances):

B4Na2O7

Structural formula as text:

Na2B4O7

Molar/atomic mass: 201.219

Melting point (°C):

742

Boiling point (°C):

1675

Solubility (g/100 g of solvent):

ethanol: insoluble [Ref.]
ethyl acetate: insoluble [Ref.]
glycerol: 111 (20°C) [Ref.]
water: 1.11 (0°C) [Ref.]
water: 3.15 (25°C) [Ref.]
water: 10.4 (50°C) [Ref.]
water: 52.5 (100°C) [Ref.]

Surface tension (mN/m):

212 (1000°C)

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

-3276.7 (s)

Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

-3081.6 (s)

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

189.5 (s)

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

186.8 (s)

Molar enthalpy (heat) of fusion ΔfusH (kJ/mol):

81

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

-3262

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

199

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

185.9

References:

  1. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 162-163 [Russian]
  2. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 11 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 83 [Russian]
  4. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 114 [Russian]
  5. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 134-135 [Russian]
  6. Химическая энциклопедия. - Т. 3. - М.: Советская энциклопедия, 1992. - pp. 180 [Russian]
  7. 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