Main page (Russian) Search in database (English)

Properties of substance:

potassium dihydrogen phosphate

Group of substances:

inorganic

Physical appearance:

colorless rhombic crystals

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

H2KO4P

Structural formula as text:

KH2PO4

Molar/atomic mass: 136.09

Melting point (°C):

252.6

Solubility (g/100 g of solvent):

ethanol: insoluble [Ref.]
ethylene glycol : 0.816 (25°C) [Ref.]
ethylene glycol : 0.839 (35°C) [Ref.]
formamide: 1.2 (25°C) [Ref.]
phosphoric acid: 11.81 (38.5°C) [Ref.]
water: 14.8 (0°C) [Ref.]
water: 18.3 (10°C) [Ref.]
water: 22.6 (20°C) [Ref.]
water: 25.1 (25°C) [Ref.]
water: 28 (30°C) [Ref.]
water: 33.5 (40°C) [Ref.]
water: 50.1 (60°C) [Ref.]
water: 70.4 (80°C) [Ref.]
water: 83.5 (90°C) [Ref.]

Properties of solutions:

10% (wt.), solvent - water
  Dynamic viscosity (mPa·s) = 1.245 (20°)
  Density (g/cm3) = 1.0703 (20°)
  Index of refraction = 1.3445 (20°)
  Freezing point (°C) = -2.23

Hygroscopic:

yes

Density:

2.34 (20°C, g/cm3)

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

-1568.6 (s)

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

-1419.2 (s)

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

134.85 (s)

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

116.57 (s)

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

-1568.3 (s)

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

-1415.9 (s)

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

134.9 (s)

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

116.6 (s)

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 852-855
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 70 [Russian]
  3. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 699 [Russian]
  4. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 88-89 [Russian]

    What information do you need?




    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru