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Properties of substance:

magnesium fluoride

Group of substances:

inorganic

Physical appearance:

colorless tetragonal crystals

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

F2Mg

Structural formula as text:

MgF2

Molar/atomic mass: 62.3

Melting point (°C):

1263

Boiling point (°C):

2250

Solubility (g/100 g of solvent):

ethanol: insoluble [Ref.]
hydrogen fluoride : 0.033 (-23°C) [Ref.]
hydrogen fluoride : 0.025 (-3.3°C) [Ref.]
hydrogen fluoride : 0.025 (12.2°C) [Ref.]
water: 0.0076 (18°C) [Ref.]

Density:

3.13 (20°C, g/cm3)

Vapour pressure (Torr):

10 (1641°C)
100 (1917°C)

Dissociation:

pKsp (0) = 8.2 (20°C, water)

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

-1113 (s)

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

-1071 (s)

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

57.25 (s)

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

61.59 (s)

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

58.2

Enthalpy (heat) of vaporization ΔvapH (kJ/mol):

272

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

-737 (g)

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

247 (g)

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

52.3 (g)

LD50 (mg/kg):

2330 (rats, oral)

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 970
  2. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 152-153 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 78 [Russian]
  4. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 25, 761 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru