Abstract
The activity coefficients of HCl (γ A ) in aqueous mixtures of HCl and NdCl3 were determined by the electromotive-force (emf) measurement of cells without liquid junctions of the type:
The experiments were carried out at nine constant total ionic strengths of I = 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 1.5, and 2.0 mol-kg−1, and at 11 temperatures from 5 to 55 ∘C, but at I = 2.0 mol-kg−1 the experimental temperatures were 5, 25 and 55 ∘C only. Harned's rule was used to represent all 728 experimental emf data points at the experimental ionic strengths and temperatures. The quadratic terms in the Harned equations for the values of logγ A were required for a good fit to the emf data, indicating the significance of ternary interactions at the experimental ionic strengths. The adjoining paper deals with the application of the Pitzer ion-interaction theory to estimate the Pitzer's mixing parameters for binary and ternary interactions.
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Roy, R.N., Roy, L.N., Himes, C.A. et al. The System HCl + NdCl3 + H2O from 5 to 55 ∘C: A Study of Harned's Rule. J Solution Chem 34, 1017–1031 (2005). https://doi.org/10.1007/s10953-005-6991-7
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DOI: https://doi.org/10.1007/s10953-005-6991-7