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Properties of substance:

potassium hydrogen carbonate

Synonyms:

potassium bicarbonate

Group of substances:

inorganic

Physical appearance:

colorless monoclinic crystals

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

CHKO3

Structural formula as text:

KHCO3

Molar/atomic mass: 100.12

Decomposition temperature (°C):

100

Solubility (g/100 g of solvent):

ethanol: insoluble [Ref.]
ethyl acetate: insoluble [Ref.]
methanol: 0.018 (25°C) [Ref.]
methanol: 0.038 (35°C) [Ref.]
water: 22.7 (0°C) [Ref.]
water: 27.9 (10°C) [Ref.]
water: 33.3 (20°C) [Ref.]
water: 36.5 (25°C) [Ref.]
water: 39.1 (30°C) [Ref.]
water: 45.6 (40°C) [Ref.]
water: 60 (60°C) [Ref.]
water: 68.3 (70°C) [Ref.]

Properties of solutions:

10% (wt.), solvent - water
  Dynamic viscosity (mPa·s) = 1.145 (20°)
  Density (g/cm3) = 1.065 (20°)
  Index of refraction = 1.3441 (20°)
  Freezing point (°C) = -3.16

Numerical data:

Interatomic distances (in pm): 107
Interatomic distances (in pm): 154
Interatomic distances (in pm): 125

Density:

2.17 (20°C, g/cm3)

Reactions:

  1. [Ref.1aster]
    KHCO3 + HI → KI + CO2 + H2O

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

-959.3 (s)

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

-860.6 (s)

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

128.7 (s)

References:

  1. Dictionary of Inorganic Compounds. - Vol. 1: Ac-C10, part 1. - Springer Science+Business Media Dordrecht, 1992. - pp. 415-416
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 68 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru