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Properties of substance:

potassium hydrogen phosphate

Group of substances:

inorganic

Physical appearance:

colorless crystals

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

HK2O4P

Structural formula as text:

K2HPO4

Molar/atomic mass: 174.18

Decomposition temperature (°C):

250

Solubility (g/100 g of solvent):

ethanol: very soluble [Ref.]
ethylene glycol : 0.842 (25°C) [Ref.]
ethylene glycol : 0.873 (35°C) [Ref.]
formamide: 4.1 (25°C) [Ref.]
water: 85.6 (0°C) [Ref.]
water: 120 (10°C) [Ref.]
water: 159.8 (20°C) [Ref.]
water: 168.4 (25°C) [Ref.]
water: 178.8 (30°C) [Ref.]
water: 210.6 (40°C) [Ref.]
water: 267.5 (63°C) [Ref.]

Properties of solutions:

8% (wt.), solvent - water
  Dynamic viscosity (mPa·s) = 1.209 (20°)
  Density (g/cm3) = 1.068 (20°)
  Index of refraction = 1.3453 (20°)
  Freezing point (°C) = -1.95

Hygroscopic:

yes

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

-1776 (s)

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

179.1 (s)

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

141.3 (s)

References:

  1. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 70 [Russian]
  2. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 233 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru