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Properties of substance:

cobalt(II) hydroxide

Group of substances:

inorganic

Physical appearance:

trigonal crystals

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

H2CoO2

Structural formula as text:

Co(OH)2

Molar/atomic mass: 92.95

Decomposition temperature (°C):

200

Solubility (g/100 g of solvent):

organic solvents: insoluble [Ref.]
water: 0.000318 (20°C) [Ref.]

Density:

3.6 (15°C, g/cm3)

Dissociation:

pKb (2) = 4.4 (25°C, water)
pKsp (0) = 15 (20°C, water)

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

-541 (s)

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

-456.1 (s)

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

82 (s)

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 431
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 73 [Russian]
  3. Чалый В.П. Гидроокиси металлов (закономерности образования, состав, структура и свойства). - Киев: Наукова думка, 1972. - pp. 45-47 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru