### Abstract

The solubility of potassium ferrate(VI) (K_{2}FeO_{4}) 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 K_{2}FeO_{4} decreased necause of the presence of K^{+} in the solution mixture. The solubility (S*) was expressed as log S* = 5.830-2019/T-5.845X_{K+}^{0.5} + 1.595X_{K+} + 724X_{K+}^{0.5}/T (σ = 0.024), where X_{K+} 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 K_{2}FeO_{4} was diminished in KOH and CsOH and similarly in LiOH and NaOH solutions. The solubility product constant (K_{sp}*), calculated from the solubility measurements, was given as log K_{sp}* = 18.10-6055/T-17.535X_{K+}^{0.5} + 4.785X_{K+} + 2171X_{K+}^{0.5}/T (σ = 0.061). The heat of dissolution (ΔH_{diss}) decreased linearly with an increase in the mole fraction of K^{+} ions. The significance of the solubility results is briefly discussed.

Original language | English (US) |
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Pages (from-to) | 5594-5597 |

Number of pages | 4 |

Journal | Journal of Chemical and Engineering Data |

Volume | 55 |

Issue number | 12 |

DOIs | |

State | Published - Dec 9 2010 |

### ASJC Scopus subject areas

- Chemistry(all)
- Chemical Engineering(all)

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## Cite this

*Journal of Chemical and Engineering Data*,

*55*(12), 5594-5597. https://doi.org/10.1021/je100417d