Solubility of ferrate(VI) in NaOH - KOH mixtures at different temperatures

Virender K. Sharma, Zuzana MácOvá, Karel Bouzek, Frank J. Millero

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11 Scopus citations


The solubility of potassium ferrate(VI) (K2FeO4) was measured in a mixture solution containing various molar ratios of KOH and NaOH at a total concentration of 14 M from (10 to 60) °C. The solubility of K2FeO4 decreased necause of the presence of K+ in the solution mixture. The solubility (S*) was expressed as log S* = 5.830-2019/T-5.845XK+0.5 + 1.595XK+ + 724XK+0.5/T (σ = 0.024), where XK+ is the mole fraction of K+ in the solution mixture and T is in Kelvin. A comparison of the values of S* in different alkali metal hydroxide solutions showed that the solubility of K2FeO4 was diminished in KOH and CsOH and similarly in LiOH and NaOH solutions. The solubility product constant (Ksp*), calculated from the solubility measurements, was given as log Ksp* = 18.10-6055/T-17.535XK+0.5 + 4.785XK+ + 2171XK+0.5/T (σ = 0.061). The heat of dissolution (ΔHdiss) decreased linearly with an increase in the mole fraction of K+ ions. The significance of the solubility results is briefly discussed.

Original languageEnglish (US)
Pages (from-to)5594-5597
Number of pages4
JournalJournal of Chemical and Engineering Data
Issue number12
StatePublished - Dec 9 2010

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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