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Properties of substance:

gold(III) hydroxide

Group of substances:

inorganic

Physical appearance:

crystals

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

H3AuO3

Structural formula as text:

Au(OH)3

Molar/atomic mass: 247.98

Decomposition temperature (°C):

150

Solubility (g/100 g of solvent):

water: 0.000077 (25°C) [Ref.]

Multicomponent solubility (in wt%):

water 99.5973%, gold(III) hydroxide 0.0027%, sodium hydroxide 0.4%, 25 °C, separating phase: Au(OH)3 [Ref.]
water 98.4382%, gold(III) hydroxide 0.0258%, sodium hydroxide 1.536%, 25 °C, separating phase: Au(OH)3 [Ref.]
water 97.388%, gold(III) hydroxide 0.012%, sodium hydroxide 2.6%, 25 °C, separating phase: Na2HAuO3 [Ref.]
water 95.9692%, gold(III) hydroxide 0.00384%, sodium hydroxide 4.027%, 25 °C, separating phase: Na2HAuO3 [Ref.]
water 74.9094%, gold(III) hydroxide 0.0106%, sodium hydroxide 25.08%, 25 °C, separating phase: Na2HAuO3 [Ref.]

Dissociation:

pKsp (0) = 45.07 (25°C, water)

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

-477.8 (s)

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

-349.8 (s)

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

121 (s)

References:

  1. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 120-121 [Russian]
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 64 [Russian]
  3. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 22 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru