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Properties of substance:

potassium manganate(VI)

Group of substances:

inorganic

Physical appearance:

green rhombic crystals

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

K2MnO4

Structural formula as text:

K2MnO4

Molar/atomic mass: 197.13

Decomposition temperature (°C):

500

Solubility (g/100 g of solvent):

water: reaction [Ref.]

Reactions of synthesis:

  1. Yeild 60%. [Ref.1]
    2MnO2 + 4KOH + O2 → 2K2MnO4 + 2H2O
  2. [Ref.1aster, Ref.2aster]
    4KMnO4 + 4KOH → 4K2MnO4 + 2H2O + O2

Reactions:

  1. [Ref.1]
    2K2MnO4 → 2K2MnO3 + O2

Electrode potential:

MnO42- + 4H+ + 2e- → MnO2 + 2H2O, E = 2.257 V (water, 25°C)

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

-1180 (s)

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

147 (s)

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-83
  2. Лидин Р.А., Андреева Л.Л., Молочко В.А. Константы неорганических веществ. - М.: Дрофа, 2006. - pp. 121 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 68 [Russian]
  4. Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 643 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru