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Properties of substance:

calcium hydrogen phosphate

Group of substances:

inorganic

Physical appearance:

colorless triclinic crystals

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

HCaO4P

Structural formula as text:

CaHPO4

Molar/atomic mass: 136.057

Decomposition temperature (°C):

900

Solubility (g/100 g of solvent):

ethanol: insoluble [Ref.]
water: 0.02 (25°C) [Ref.]

Dissociation:

pKsp (0) = 5.3 (25°C, water)

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

-1820.9 (s)

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

-1679.9 (s)

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

88 (s)

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 4-55
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 72 [Russian]
  3. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 94-95 [Russian]
  4. Фрумина Н.С., Кручкова Е.С., Муштакова С.П. Аналитическая химия кальция. - М.: Наука, 1974. - pp. 12 [Russian]
  5. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 237 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru