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Properties of substance:

sodium pyrophosphate

Group of substances:

inorganic

Physical appearance:

colorless rhombic crystals

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

Na4O7P2

Structural formula as text:

Na4P2O7

Molar/atomic mass: 265.9

Melting point (°C):

880

Solubility (g/100 g of solvent):

ethylene glycol : soluble with solvolysis [Ref.]
ethylene glycol monomethyl ether: 0.456 (25°C) [Ref.]
ethylene glycol monomethyl ether: 0.677 (35°C) [Ref.]
glycerol: 1.212 (25°C) [Ref.]
glycerol: 1.407 (35°C) [Ref.]
water: 2.29 (0°C) [Ref.]
water: 5.5 (20°C) [Ref.]
water: 7.09 (25°C) [Ref.]
water: 7.57 (30°C) [Ref.]
water: 16.3 (50°C) [Ref.]
water: 24.6 (60°C) [Ref.]
water: 54.2 (82°C) [Ref.]
water: 45.2 (96°C) [Ref.]

Density:

2.37 (20°C, g/cm3)

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

-3166 (s)

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

-3001 (s)

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

270 (s)

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

241 (s)

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

59

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-91
  2. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1291-1292
  3. Гринвуд Н., Эрншо А. Химия элементов. - Т.1. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 491 [Russian]
  4. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 168-169 [Russian]
  5. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 86 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru