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Properties of substance:

potassium chromate

Group of substances:

inorganic

Physical appearance:

yellow rhombic crystals

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

CrK2O4

Structural formula as text:

K2CrO4

Molar/atomic mass: 194.19

Melting point (°C):

980

CAS №: 7789-00-6

Solubility (g/100 g of solvent):

acetone: insoluble [Ref.]
ammonia liquid : insoluble [Ref.]
benzonitrile: insoluble [Ref.]
diethyl ether: insoluble [Ref.]
ethanol: 0.005 (25°C) [Ref.]
ethyl acetate: insoluble [Ref.]
ethylene glycol : 1.7 (15.4°C) [Ref.]
hydrazine: 1 [Ref.]
hydrogen fluoride : reaction [Ref.]
methyl acetate: insoluble [Ref.]
water: 59 (0°C) [Ref.]
water: 63 (20°C) [Ref.]
water: 65 (25°C) [Ref.]
water: 67 (40°C) [Ref.]
water: 71 (60°C) [Ref.]
water: 75 (80°C) [Ref.]
water: 79 (100°C) [Ref.]

Density:

2.73 (18°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1aster]
    2KOH + CrO3 → K2CrO4 + H2O

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

-1382.8 (s)

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

-1286 (s)

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

193.3 (s)

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

146 (s)

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

28.9

Spectral properties of the substance:

Ultraviolet/visible spectrum (maximum in nm, layer thickness 1 cm, in parentheses - extinction) = 373 (461)

References:

  1. Armarego W. L. F. Purification of Laboratory Chemicals. - 7ed. - 2013. - pp. 600
  2. Comey A. M., Hahn D. A. A dictionary of Chemical Solubilities Inorganic. - 2 ed. - New York, The MacMillan Company, 1921. - pp. 261-262
  3. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 796-800
  4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 70 [Russian]
  5. Химическая энциклопедия. - Т. 5. - М.: Советская энциклопедия, 1999. - pp. 320 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru