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Properties of substance:

rubidium hydroxide

Group of substances:

inorganic

Physical appearance:

colorless rhombic crystals

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

HORb

Structural formula as text:

RbOH

Molar/atomic mass: 102.48

Melting point (°C):

301

Solubility (g/100 g of solvent):

ammonia liquid : 1.3 (-40°C) [Ref.]
ethanol: soluble [Ref.]
water: 179 (15°C) [Ref.]
water: 282 (47°C) [Ref.]
water: 964 (95°C) [Ref.]
water: 980 (100°C) [Ref.]

Hygroscopic:

very hygroscopic

Density:

3.203 (11°C, g/cm3)

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

-419 (s)

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

92 (s)

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

69 (s)

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

8.9

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

-242.8 (g)

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

249 (g)

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

49 (g)

LD50 (mg/kg):

586 (rats, oral)
840-900 (mice, oral)

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1439
  2. Вредные химические вещества: Неорганические соединения элементов I-IV групп. Справочник. - Л.: Химия, 1988. - pp. 53 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 93 [Russian]
  4. Редкие и рассеянные элементы. Химия и технология. - Кн. 1. - М.: Мисис, 1996. - pp. 72-74 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru