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Properties of substance:

copper(I) iodide

Synonyms:

cuprous iodide

Group of substances:

inorganic

Physical appearance:

colorless cubic crystals

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

CuI

Structural formula as text:

CuI

Molar/atomic mass: 190.45

Melting point (°C):

600

Boiling point (°C):

1320

Solubility (g/100 g of solvent):

acetone: insoluble [Ref.]
acetonitrile: 3.52 (18°C) [Ref.]
ammonia liquid : very soluble [Ref.]
carbon disulphide: insoluble [Ref.]
dimethylsulfoxide: 0.9 (30°C) [Ref.]
methyl acetate: soluble [Ref.]
methylene iodide: practically insoluble [Ref.]
pyridine: 1.74 (25°C) [Ref.]
water: 0.0005 (18°C) [Ref.]

Density:

5.65 (20°C, g/cm3)

Vapour pressure (Torr):

10 (654°C)
100 (905°C)

Electrode potential:

CuI + e- → Cu + I-, E = -0.185 V (water, 25°C)

Dissociation:

pKsp (0) = 12 (20°C, water)

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

-68 (s)

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

-69.7 (s)

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

96.7 (s)

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

54 (s)

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

8.28

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

25

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

153.2 (g)

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

255.6 (g)

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

36.5 (g)

References:

  1. Comey A. M., Hahn D. A. A dictionary of Chemical Solubilities Inorganic. - 2 ed. - New York, The MacMillan Company, 1921. - pp. 305-306
  2. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 490
  3. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 156-157 [Russian]
  4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 80 [Russian]
  5. Справочник химика. - Т. 3. - М.-Л.: Химия, 1965. - pp. 746 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru