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Properties of substance:

sodium pyrophosphate decahydrate

Group of substances:

inorganic

Physical appearance:

colorless monoclinic crystals

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

H20Na4O17P2

Structural formula as text:

Na4P2O7 * 10H2O

Molar/atomic mass: 446.055

Melting point (°C):

79.5

Decomposition temperature (°C):

79.5

Solubility (g/100 g of solvent):

water: 5.41 (0°C) [Ref.]
water: 6.81 (10°C) [Ref.]
water: 10.92 (20°C) [Ref.]
water: 18.11 (30°C) [Ref.]
water: 24.97 (40°C) [Ref.]
water: 33.25 (50°C) [Ref.]
water: 44.07 (60°C) [Ref.]
water: 77.47 (90°C) [Ref.]
water: 93.11 (100°C) [Ref.]

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

-6125 (s)

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

689 (s)

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

645 (s)

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

110

References:

  1. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 168-169 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru