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Properties of substance:

potash

Synonyms:

potassium carbonate

Group of substances:

inorganic

Physical appearance:

colorless monoclinic crystals

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

CK2O3

Structural formula as text:

K2CO3

CAS No: 584-08-7

Molar/atomic mass: 138.21

Melting point (°C):

891

Solubility (g/100 g of solvent):

N-methylpyrrolidone: 2.3 (room temperature) [Ref.]
acetone: insoluble [Ref.]
ammonia liquid : insoluble [Ref.]
benzonitrile: insoluble [Ref.]
dimethylacetamide: 0.49 (room temperature) [Ref.]
dimethylformamide: 0.8 (room temperature) [Ref.]
dimethylsulfoxide: 4.3 (room temperature) [Ref.]
ethanol abs.: insoluble [Ref.]
ethyl acetate: insoluble [Ref.]
ethylene glycol : 34.4 (25°C) [Ref.]
glycerol: 39.4 (20°C) [Ref.]
hydrazine: 1 (20°C) [Ref.]
methanol: 6 (25°C) [Ref.]
methyl acetate: insoluble [Ref.]
sulfolane: 1.26 (room temperature) [Ref.]
water: 107 (0°C) [Ref.]
water: 109.2 (10°C) [Ref.]
water: 111 (20°C) [Ref.]
water: 112.3 (25°C) [Ref.]
water: 113.7 (30°C) [Ref.]
water: 116.9 (40°C) [Ref.]
water: 125.7 (60°C) [Ref.]
water: 139.2 (80°C) [Ref.]
water: 155.8 (100°C) [Ref.]
water: 274 (200°C) [Ref.]

Multicomponent solubility (in wt%):

water 30.3%, IPA 69.6%, potash 0.1%, 25 °C [Ref.]
water 76.04%, IPA 10.1%, potash 13.86%, 25 °C [Ref.]
water 47.1%, IPA 0.23%, potash 52.67%, 25 °C [Ref.]
(layer 1): water 53.04%, ethanol 44.82%, potash 2.14%, (layer 2): water 70.61%, ethanol 9.28%, potash 20.11%, 25 °C [Ref.]
(layer 1): water 22.76%, ethanol 76.82%, potash 0.35%, (layer 2): water 59.82%, ethanol 1.38%, potash 38.8%, 25 °C [Ref.]
(layer 1): water 12.73%, ethanol 87.17%, potash 0.2%, (layer 2): water 50.16%, ethanol 0.34%, potash 49.5%, 25 °C [Ref.]
(layer 1): water 31.01%, 1-propanol 68.47%, potash 0.42%, (layer 2): water 77.92%, 1-propanol 6.94%, potash 15.14%, 25 °C [Ref.]
(layer 1): water 16.42%, 1-propanol 83.35%, potash 0.23%, (layer 2): water 69.43%, 1-propanol 0.56%, potash 30.01%, 25 °C [Ref.]
(layer 1): water 10.06%, 1-propanol 89.91%, potash 0.13%, (layer 2): water 55.71%, 1-propanol 0.%, potash 44.29%, 25 °C [Ref.]
(layer 1): water 49.65%, IPA 48.54%, potash 1.81%, (layer 2): water 75.89%, IPA 8.99%, potash 15.12%, 25 °C [Ref.]
(layer 1): water 24.26%, IPA 75.17%, potash 0.58%, (layer 2): water 69.79%, IPA 0.79%, potash 29.42%, 25 °C [Ref.]
(layer 1): water 7.07%, IPA 92.85%, potash 0.18%, (layer 2): water 50.45%, IPA 0.05%, potash 49.5%, 25 °C [Ref.]

Properties of solutions:

40% (wt.), solvent - water
  Dynamic viscosity (mPa·s) = 4.36 (20°)
  Density (g/cm3) = 1.4142 (20°)
  Index of refraction = 1.4006 (20°)
  Freezing point (°C) = -37.55
53% (wt.), solvent - water
  Density (g/cm3) = 1.5673 (20°)

Hygroscopic:

yes

Density:

2.43 (19°C, g/cm3)

    Viscosity (mPa·s):

    3.03 (917°C)
    1.66 (977°C)

    Surface tension (mN/m):

    168.4 (910°C)
    162.1 (1010°C)

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

    -1146.1 (s)

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

    -1059.8 (s)

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

    156.32 (s)

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

    115.7 (s)

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

    32.6

    LD50 (mg/kg):

    1870 (rats, oral)

    References:

    1. Armarego W. L. F. Purification of Laboratory Chemicals. - 5ed. - 2003. - pp. 453
    2. Armarego W. L. F. Purification of Laboratory Chemicals. - 7ed. - 2013. - pp. 599
    3. Comey A. M., Hahn D. A. A dictionary of Chemical Solubilities Inorganic. - 2 ed. - New York, The MacMillan Company, 1921. - pp. 197-202
    4. Schlager N., Weisblatt J., Newton D.E. Chemical Compounds. - 2006. - pp. 633-637
    5. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 726-740
    6. Вредные химические вещества: Неорганические соединения элементов I-IV групп. Справочник. - Л.: Химия, 1988. - pp. 47 [Russian]
    7. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 239, 241 [Russian]
    8. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 68 [Russian]
    9. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 696 [Russian]
    10. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 86-87 [Russian]
    11. Справочник химика. - Т. 3. - М.-Л.: Химия, 1965. - pp. 299, 301 [Russian]
    12. Химическая технология неорганических веществ. - Кн.1, под ред. Ахметова Т.Г. - М.: Высшая школа, 2002. - pp. 136-144 [Russian]
    13. Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 288 [Russian]
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru