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Properties of substance:

calcium tungstate(VI)

Group of substances:

inorganic

Physical appearance:

colorless tetragonal crystals

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

CaO4W

Structural formula as text:

CaWO4

Molar/atomic mass: 287.93

Melting point (°C):

1580

Solubility (g/100 g of solvent):

ethanol: insoluble [Ref.]
water: 0.00133 (20°C) [Ref.]
water: 0.00024 (90°C) [Ref.]

Numerical data:

Hardness on the Mohs’ scale: 5

Density:

6.06 (20°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1aster]
    CaCO3 + WO3 → CaWO4 + CO2

Refractive index (nD):

1.918 (20°C)

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

-1683.6 (s)

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

-1576.9 (s)

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

151 (s)

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

112.17 (s)

References:

  1. Dean J.A. Lange's handbook of chemistry. - 1999. - pp. 3.23
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 71 [Russian]
  3. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 92-93 [Russian]
  4. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 236 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru