A mathematical model for calculation of equilibrium solution speciations for the FeCl3-FeCl2-CuCl2-CuCl-HCl-NaCl-H2O system at 25 ‡C
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Equilibrium solution speciation computations were performed for the FeCl-FeCl3-CuCl2-CuCl-HCl-NaCl-H2O system at 25 ‡C. In dilute solutions, complexation of Fe(III), Fe(II), and Cu(II) is insignificant but the major Cu(I) species is CuCl2-. In concentrated solutions, FeCl30, FeCl20, and CuCl20 are the major Fe(III), Fe(II), and Cu(II) species, and CuCl32- is the most important cuprous complex. High Cu(I)/Cu(II) ratios are apparently more readily attainable in CuCl2 than in FeCl3 media. The Cu(I)/Cu(II) ratio is increased by making the solution more concentrated in any component except FeCl3 or CuCl2. Neither the ionic strength nor the total chloride concentration is a good predictor of the Cu(I)/Cu(II) ratio.
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