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Properties of substance:

sodium chromate

Group of substances:

inorganic

Physical appearance:

yellow rhombic crystals

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

CrNa2O4

Structural formula as text:

Na2CrO4

Molar/atomic mass: 161.97

Melting point (°C):

794

Solubility (g/100 g of solvent):

ammonia liquid : insoluble [Ref.]
chromyl chloride: insoluble [Ref.]
ethanol: sparingly soluble [Ref.]
methanol: 0.345 (25°C) [Ref.]
water: 31.4 (0°C) [Ref.]
water: 48.2 (10°C) [Ref.]
water: 76.6 (20°C) [Ref.]
water: 84.5 (25°C) [Ref.]
water: 95.3 (40°C) [Ref.]
water: 115.1 (60°C) [Ref.]
water: 122.2 (80°C) [Ref.]
water: 126.7 (100°C) [Ref.]
water: 133 (150°C) [Ref.]

Density:

2.72 (20°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1, Ref.2]
    4Fe(CrO2)2 + 8Na2CO3 + 7O2 → 8Na2CrO4 + 2Fe2O3 + 8CO2

Reactions:

  1. Yeild 83%. [Ref.1]
    2Na2CrO4 + 2CO2 + H2O → Na2Cr2O7 + 2NaHCO3

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

-1333 (s)

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

-1232 (s)

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

174.5 (s)

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

142.1 (s)

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

24.7

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1255-1257
  2. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 170-171 [Russian]
  3. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 372 [Russian]
  4. Неорганические соединения хрома: Справочник. - Л.: Химия, 1981. - pp. 122 [Russian]
  5. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 86 [Russian]
  6. Рипан Р., Четяну И. Неорганическая химия. - Т.2. - М.: Мир, 1972. - pp. 265 [Russian]
  7. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 131, 671 [Russian]
  8. Химическая технология неорганических веществ. - Кн.2, под ред. Ахметова Т.Г. - М.: Высшая школа, 2002. - pp. 147-148 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru