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Properties of substance:

sodium phosphate dodecahydrate

Group of substances:

inorganic

Physical appearance:

colorless trigonal crystals

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

H24Na3O16P

Structural formula as text:

Na3PO4 * 12H2O

Molar/atomic mass: 380.12

Melting point (°C):

73.4

Decomposition temperature (°C):

100

Solubility (g/100 g of solvent):

carbon disulphide: insoluble [Ref.]
ethanol: insoluble [Ref.]
methyl acetate: insoluble [Ref.]
water: 28.3 (20°C) [Ref.]

Density:

1.64 (20°C, g/cm3)

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

-5480 (s)

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

660 (s)

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

665 (s)

References:

  1. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 168-169 [Russian]
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 85 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru