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Properties of substance:

sodium hydrogen phosphate

Group of substances:

inorganic

Physical appearance:

crystals

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

HNa2O4P

Structural formula as text:

Na2HPO4

Molar/atomic mass: 141.959

Decomposition temperature (°C):

300

Solubility (g/100 g of solvent):

dimethylformamide: 0.05 (25°C) [Ref.]
ethanol: 0.33 (15.5°C) [Ref.]
ethylene glycol : 0.864 (25°C) [Ref.]
ethylene glycol : 0.925 (35°C) [Ref.]
methanol: 0.24 (15°C) [Ref.]
water: 1.55 (-0.48°C) [Ref.]
water: 1.631 (0°C) [Ref.]
water: 6.367 (18°C) [Ref.]
water: 7.65 (20°C) [Ref.]
water: 12 (25°C) [Ref.]
water: 67.3 (45°C) [Ref.]
water: 102.14 (99.77°C) [Ref.]

Properties of solutions:

5% (wt.), solvent - water
  Dynamic viscosity (mPa·s) = 1.254 (20°)
  Density (g/cm3) = 1.0478 (20°)
  Index of refraction = 1.3424 (20°)

Reactions:

  1. [Ref.1aster, Ref.2aster]
    Na2HPO4 + 2HCl → H3PO4 + 2NaCl

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

-1748.1 (s)

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

-1608.2 (s)

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

150.5 (s)

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

135.3 (s)

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-13
  2. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1288-1289
  3. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 120-121 [Russian]
  4. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 146-147 [Russian]
  5. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 363 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru