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Properties of substance:

mercury(II) iodide

Group of substances:

inorganic

Physical appearance:

red tetragonal crystals

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

HgI2

Structural formula as text:

HgI2

Molar/atomic mass: 454.4

Melting point (°C):

259

Boiling point (°C):

353

Solubility (g/100 g of solvent):

1,2-dibromoethane: 0.748 (20°C) [Ref.]
1,2-dichloroethane: 1.2 (85.5°C) [Ref.]
1,4-dioxane: soluble [Ref.]
1-pentanol: 0.66 (13°C) [Ref.]
1-pentanol: 3.66 (71°C) [Ref.]
acetic acid: 0.083 (31°C) [Ref.]
acetic acid: 0.159 (47°C) [Ref.]
acetic acid: 0.49 (76°C) [Ref.]
acetic acid: 1.45 (110°C) [Ref.]
acetone: 2.1 (25°C) [Ref.]
acetone: 4.73 (40°C) [Ref.]
acetone: 6.07 (58°C) [Ref.]
aniline: 42.85 (17.8°C) [Ref.]
aniline: 96.49 (42.9°C) [Ref.]
antimony trichloride: very soluble [Ref.]
benzene: 0.22 (15°C) [Ref.]
benzene: 0.25 (23°C) [Ref.]
benzene: 0.88 (60°C) [Ref.]
bromoethane: 0.643 (20°C) [Ref.]
bromoethane: 0.773 (38°C) [Ref.]
bromoform: 0.486 (20°C) [Ref.]
carbon disulphide: 0.107 (-10°C) [Ref.]
carbon disulphide: 0.173 (0°C) [Ref.]
carbon disulphide: 0.32 (20°C) [Ref.]
carbon disulphide: 0.447 (30°C) [Ref.]
carbon tetrachloride: 0.017 (18°C) [Ref.]
carbon tetrachloride: 0.094 (75°C) [Ref.]
chloroform: 0.07 (23°C) [Ref.]
chloroform: 0.163 (61°C) [Ref.]
diethyl ether: 0.62 (0°C) [Ref.]
diethyl ether: 0.97 (36°C) [Ref.]
dimethylamine: very soluble [Ref.]
dimethylsulfoxide: 100 [Ref.]
ethanol: 1.48 (18°C) [Ref.]
ethanol: 2.19 (25°C) [Ref.]
ethanol: 4.325 (78°C) [Ref.]
ethyl acetate: 1.56 (17.5°C) [Ref.]
ethyl acetate: 1.64 (21°C) [Ref.]
ethyl acetate: 3.19 (55°C) [Ref.]
ethyl acetate: 4.31 (76°C) [Ref.]
ethyl formane: 2.15 (55°C) [Ref.]
glycerol: soluble [Ref.]
hexane: 0.072 (67°C) [Ref.]
hydrazine: reaction 69 (20°C) [Ref.]
i-butanol: 0.51 (22.5°C) [Ref.]
i-propanol: 2.266 (81°C) [Ref.]
iodine liquid: soluble [Ref.]
iodoethane: 2.041 (20°C) [Ref.]
methanol: 3.16 (19.5°C) [Ref.]
methanol: 3.98 (23°C) [Ref.]
methanol: 6.51 (66°C) [Ref.]
methyl acetate: 2.5 (58°C) [Ref.]
methyl formate: 1.166 (37°C) [Ref.]
methylamine: very soluble [Ref.]
methylene iodide: 2.5 (15°C) [Ref.]
methylene iodide: 16.6 (100°C) [Ref.]
methylene iodide: 58 (180°C) [Ref.]
propanol: 1.25 (19°C) [Ref.]
pyridine: 17.4 (-0.1°C) [Ref.]
pyridine: 32.3 (20.02°C) [Ref.]
pyridine: 93.39 (60.07°C) [Ref.]
sulfur dioxide: 0.012 (0°C) [Ref.]
trimethylamine: soluble [Ref.]
water: 0.004 (17.5°C) [Ref.]
water: 0.0054 (22°C) [Ref.]

Multicomponent solubility (in wt%):

water 29.8%, potassium iodide 50.9%, mercury(II) iodide 19.3%, 20 °C, separating phase: KI [Ref.]
water 13.%, potassium iodide 39.%, mercury(II) iodide 48.%, 20 °C, separating phase: KI [Ref.]
water 9.%, potassium iodide 37.4%, mercury(II) iodide 53.6%, 20 °C, separating phase: K2HgI4 [Ref.]
water 9.6%, potassium iodide 37.8%, mercury(II) iodide 52.6%, 20 °C, separating phase: KHgI3 [Ref.]
water 13.3%, potassium iodide 35.5%, mercury(II) iodide 51.2%, 20 °C, separating phase: KHgI3 * H2O [Ref.]

Density:

6.36 (20°C, g/cm3)

Vapour pressure (Torr):

0.000001 (4.2°C)
0.00001 (21.3°C)
0.0001 (40.8°C)
0.001 (62.8°C)
0.01 (89°C)
1 (156°C)
10 (203°C)
100 (262°C)

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

    -105.4 (s)

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

    -103.05 (s)

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

    184.05 (s)

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

    78.2 (s)

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

    18.8

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

    60.2

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

    -15.9 (g)

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

    329 (g)

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

    61.1 (g)

    References:

    1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 640-648
    2. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 196-197 [Russian]
    3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 92 [Russian]
    4. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 295, 834-839 [Russian]
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru