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Solubility Modeling of the Binary Systems Fe(NO3)3–H2O, Co(NO3)2–H2O and the Ternary System Fe(NO3)3–Co(NO3)2–H2O with the Extended Universal Quasichemical (UNIQUAC) Model

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Abstract

Solubility modeling in the binary system Fe(NO3)3–H2O, Co(NO3)2–H2O and the ternary system Fe(NO3)3–Co(NO3)2–H2O is presented. The extended UNIQUAC model was applied to the thermodynamic assessment of the investigated systems. The model parameters obtained were regressed simultaneously using the available databank but with more experimental points, recently published in the open literature. A revision of previously published parameters for the cobalt ion and new parameters for the iron(III) nitrate system are presented. Based on this set of parameters, the equilibrium constants of hydrates are determined. The model represents the experimental data with good accuracy from the freezing point region to the boiling points of the solutions.

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Abbreviations

A D–H :

Debye–Hückel parameter (kg1/2·mol−1/2)

K :

Equilibrium constant

A :

Activity

A, B, C, D and E :

Parameters of Eq. 22

aq:

Aqueous

b :

Debye–Hückel parameter (kg1/2·mol−1/2)

I :

Ionic strength based on molality

m :

Molality (mol·kg−1 H2O)

p :

Pressure (kPa)

q :

Surface area

R :

Gas constant (J·mol−1·K−1)

r :

Volume parameter

T :

Temperature (K)

u, u 0 u t :

UNIQUAC interaction parameters

x :

Mole fraction

\( M_{w} \) :

Molecular weight of water (kg·mol−1)

n :

Mole number

\( \gamma \) :

Activity coefficient

∞:

Infinite dilution

0:

Standard state

*:

Asymmetrical

ex:

Excess

i :

Index

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Authors and Affiliations

  1. Laboratory “Physical Chemistry of Processes and Materials” Faculty of Science and Technology, University Hassan 1, Settat, Morocco

    Mouad Arrad, Mohammed Kaddami & Bahija El Goundali

  2. Department of Chemical and Biochemical Engineering, Technical University of Denmark, 2800, Kongens Lyngby, Denmark

    Kaj Thomsen

Authors
  1. Mouad Arrad
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  2. Mohammed Kaddami
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  3. Bahija El Goundali
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  4. Kaj Thomsen
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Correspondence to Mouad Arrad.

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Arrad, M., Kaddami, M., Goundali, B.E. et al. Solubility Modeling of the Binary Systems Fe(NO3)3–H2O, Co(NO3)2–H2O and the Ternary System Fe(NO3)3–Co(NO3)2–H2O with the Extended Universal Quasichemical (UNIQUAC) Model. J Solution Chem 45, 534–545 (2016). https://doi.org/10.1007/s10953-016-0457-y

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