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Properties of substance:

potassium permanganate

Synonyms:

калий марганцовокислый

Group of substances:

inorganic

Physical appearance:

rhombic crystals

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

KMnO4

Structural formula as text:

KMnO4

Molar/atomic mass: 158.03

Decomposition temperature (°C):

200

Solubility (g/100 g of solvent):

acetic acid: soluble [Ref.]
acetone: 2.14 (13°C) [Ref.]
ammonia liquid : soluble [Ref.]
deuterium oxide: 2.31 (5°C) [Ref.]
deuterium oxide: 3.62 (15°C) [Ref.]
deuterium oxide: 5.39 (25°C) [Ref.]
deuterium oxide: 7.81 (35°C) [Ref.]
ethanol: reaction [Ref.]
ethyl acetate: insoluble [Ref.]
ethylene carbonate: soluble (40°C) [Ref.]
hydrazine: reaction 2 (20°C) [Ref.]
hydrogen chloride liquid anhydrous: insoluble [Ref.]
hydrogen cyanide: soluble [Ref.]
hydrogen fluoride : reaction [Ref.]
methanol: soluble [Ref.]
pyridine: soluble [Ref.]
water: 4.22 (10°C) [Ref.]
water: 5.31 (15°C) [Ref.]
water: 6.36 (20°C) [Ref.]
water: 7.63 (25°C) [Ref.]
water: 9 (30°C) [Ref.]
water: 12.5 (40°C) [Ref.]
water: 16.8 (50°C) [Ref.]
water: 25 (65°C) [Ref.]

Properties of solutions:

5% (wt.), solvent - water
  Dynamic viscosity (mPa·s) = 0.989 (20°)
  Density (g/cm3) = 1.0322 (20°)

Density:

2.7 (20°C, g/cm3)

Reactions:

  1. Yeild 76-78%. [Ref.1aster]
    3CH3(CH2)5CHO + 2KMnO4 + H2SO4 → 3CH3(CH2)5COOH + K2SO4 + 2MnO2 + H2O
  2. [Ref.1, Ref.2aster]
    2KMnO4 + H2SO4 → Mn2O7 + K2SO4 + H2O
  3. [Ref.1aster, Ref.2aster]
    4KMnO4 + 4KOH → 4K2MnO4 + 2H2O + O2

Refractive index (nD):

1.59 (20°C)

Electrode potential:

MnO4- + e- → MnO42-, E = 0.558 V (water, 25°C)
MnO4- + 2H2O + 3e- → MnO2 + 4OH-, E = 0.621 V (water, 25°C)
MnO4- + 8H+ + 5e- → Mn2+ + 4H2O, E = 1.531 V (water, 25°C)

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

-813.4 (s)

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

-713.8 (s)

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

171.71 (s)

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

119.2 (s)

LD50 (mg/kg):

750 (mice, oral)

Spectral properties of the substance:

Ultraviolet/visible spectrum (maximum in nm, layer thickness 1 cm, in parentheses - extinction) = 545 (242)
Ultraviolet/visible spectrum (maximum in nm, layer thickness 1 cm, in parentheses - extinction) = 525 (223)

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 827-830
  2. Бабаян Э.А., Гаевский А.В., Бардин Е.В. Правовые аспекты оборота наркотических, психотропных, сильнодействующих, ядовитых веществ и прекурсоров. - М.: МЦФЭР, 2000. - pp. 147 [Russian]
  3. Давыдова С.Л. Удивительные макроциклы. - Л.: Химия, 1989. - pp. 45 [Russian]
  4. Лидин Р.А., Аликберова Л.Ю., Логинова Г.П. Неорганическая химия в вопросах. - М.: Химия, 1991. - pp. 173-174 [Russian]
  5. Неорганическая химия. – Под ред. Третьякова Ю.Д., Т.3, Кн.1. - М.: Академия, 2007. - pp. 318-322 [Russian]
  6. Новый справочник химика и технолога. Химическое равновесие. Свойства растворов. - СПб.: НПО Профессионал, 2004, 2007. - pp. 419 [Russian]
  7. Позин М.Е. Технология минеральных солей (удобрений, пестицидов, промышленных солей, окислов и кислот). - Ч.1. - Л.: Химия, 1974. - pp. 779-785 [Russian]
  8. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 69 [Russian]
  9. Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 289 [Russian]
  10. Химия и жизнь. - 1990. - №2. - pp. 81 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru