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Properties of substance:

magnesium hydroxide

Group of substances:

inorganic

Physical appearance:

colorless trigonal crystals

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

H2MgO2

Structural formula as text:

Mg(OH)2

Molar/atomic mass: 58.32

Decomposition temperature (°C):

480

Solubility (g/100 g of solvent):

water: 0.00064 (25°C) [Ref.]
water: 0.004 (100°C) [Ref.]

Multicomponent solubility (in wt%):

water 64.18%, magnesium hydroxide 0.07%, magnesium chloride 35.75%, 25 °C, separating phase: MgCl2 * 6H2O [Ref.]
water 65.87%, magnesium hydroxide 0.12%, magnesium chloride 34.01%, 25 °C, separating phase: MgCl2 * 3Mg(OH)2 * 8H2O [Ref.]
water 67.52%, magnesium hydroxide 0.39%, magnesium chloride 32.09%, 25 °C, separating phase: MgCl2 * 3Mg(OH)2 * 8H2O [Ref.]

Density:

2.4 (20°C, g/cm3)

Dissociation:

pKb (2) = 2.6 (25°C, water)

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

-924.7 (s)

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

-833.7 (s)

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

63.14 (s)

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

77.03 (s)

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 982-983
  2. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 118 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 77 [Russian]
  4. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 234 [Russian]
  5. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 309 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru