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Activity measurements in aqueous mixed electrolyte solutions—III. HClCaCl2 mixtures of constant total ionic strength
Authors:A Mukherjee  M Sengupta
Affiliation:Department of Chemistry, University College of Science, Calcutta 700009, India
Abstract:Emf measurements have been made in cells without liquid junction of the type H2/HX (m1), MXn(m2)/AgCl, Ag . . (I) containing mixtures of HCl and CaCl2 in different proportions, but at constant total ionic strength (I = 2, 1, 0.5). The measurements have been carried out at 5°C intervals over the temperature range 5–35°C. AgAgCl electrodes prepared by two different methods (thermal and thermoelectrolytic) were used of which the thermoelectrolytic electrodes were found to give more consistent results. The results when extrapolated properly lead to E° values at the different temperatures which agree well with those reported in literature. The application of the Pitzer method leads to the calculation of the ionic interaction coefficients α12 and α21, at the different constant ionic strengths. The nature of variation of these α's with the total mixture ionic strength at different temperatures has been considered.
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