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Properties of substance:

calcium hydrogen phosphate dihydrate

Group of substances:

inorganic

Physical appearance:

colorless monoclinic crystals

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

H5CaO6P

Structural formula as text:

CaHPO4 * 2H2O

Molar/atomic mass: 172.09

Decomposition temperature (°C):

100

Solubility (g/100 g of solvent):

ethanol: insoluble [Ref.]
water: 0.02 (25°C) [Ref.]
water: 0.04 (40°C) [Ref.]
water: 0.105 (60°C) [Ref.]

Density:

2.31 (16°C, g/cm3)

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

-2410 (s)

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

-2153.1 (s)

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

167 (s)

References:

  1. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 140-141 [Russian]
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 72 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru