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Properties of substance:

potassium sulfate

Synonyms:

potassium sulphate

Group of substances:

inorganic

Physical appearance:

colorless rhombic crystals

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

K2O4S

Structural formula as text:

K2SO4

Molar/atomic mass: 174.25

Melting point (°C):

1070

Boiling point (°C):

2000

Solubility (g/100 g of solvent):

acetic acid: practically insoluble [Ref.]
acetone: insoluble [Ref.]
ammonia liquid : insoluble [Ref.]
carbon disulphide: insoluble [Ref.]
deuterium oxide: 8.7 (25°C) [Ref.]
ethanol: insoluble [Ref.]
ethanol 40%: 0.16 (40°C) [Ref.]
ethyl acetate: insoluble [Ref.]
ethylene glycol : insoluble [Ref.]
formic acid 95%: 36.5 (21°C) [Ref.]
glycerol: 1.317 (20°C) [Ref.]
hydrazine: 5 (20°C) [Ref.]
hydrogen fluoride : soluble [Ref.]
hydrogen peroxide: 96.1 (0°C) [Ref.]
hydroxylamine: 3.5 (18°C) [Ref.]
methanol: 0.0596 (25°C) [Ref.]
nickel tetracarbonyl: insoluble [Ref.]
sulfur dioxide: insoluble [Ref.]
sulfuric acid: 11.61 (36.5°C) [Ref.]
sulfuric acid: 41.42 (105.4°C) [Ref.]
water: 7.18 (0°C) [Ref.]
water: 9.3 (10°C) [Ref.]
water: 11.1 (20°C) [Ref.]
water: 12 (25°C) [Ref.]
water: 13 (30°C) [Ref.]
water: 14.8 (40°C) [Ref.]
water: 18.2 (60°C) [Ref.]
water: 21.4 (80°C) [Ref.]
water: 24.1 (100°C) [Ref.]

Multicomponent solubility (in wt%):

water 68.5%, sodium chloride 23.3%, potassium sulfate 6.1%, potassium chloride 2.1%, 20 °C, separating phase: NaCl + NaK3(SO4)2 [Ref.]
water 93.44%, potassium sulfate 5.62%, silver sulfate 0.94%, 33 °C [Ref.]
water 87.023%, potassium sulfate 11.8%, silver sulfate 1.177%, 33 °C [Ref.]

Properties of solutions:

10% (wt.), solvent - water
  Dynamic viscosity (mPa·s) = 1.132 (20°)
  Density (g/cm3) = 1.0806 (20°)
  Index of refraction = 1.3452 (20°)

Density:

2.66 (20°C, g/cm3)

Surface tension (mN/m):

144 (1070°C)
129 (1306°C)
107 (1656°C)

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

-1433.7 (s)

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

-1316.4 (s)

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

175.7 (s)

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

130.1 (s)

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

36.65

LD50 (mg/kg):

6600 (rats, oral)
6600 (mice, oral)
1250 (mice, intraperitoneal)

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 859-879
  2. Вредные химические вещества: Неорганические соединения элементов I-IV групп. Справочник. - Л.: Химия, 1988. - pp. 48 [Russian]
  3. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 132-133 [Russian]
  4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 69 [Russian]
  5. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 162-163 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru