Abstract
From e.m.f. measurements on the concentration cells Ag|AgCl|RbCl (m)∥RbCl (m f)|AgCl|Ag and Rb-amalgam|RbCl (m f)∥RbCl (m)Rb-amalgam, the ion and solvent transference numbers have been determined for aqueous RbCl solutions at molalities up to 7 mol kg−1 over the temperature range from 25 to 55°C. From the ionic transference numbers found, aqueous RbCl emerges as the most closely equitransferent salt bridge ever characterized. Considering also its high solubility (7.8 mol kg−1 at 25°C), RbCl is recommended as a built-in salt bridge for reference electrodes, in view of replacing the insufficiently equitransferent KCl bridges so far adopted by manufacturers.
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Buizza, C., Mussini, P.R., Mussini, T. et al. Characterization of aqueous rubidium chloride as an equitransferent ultraconcentrated salt bridge. J Appl Electrochem 26, 337–341 (1996). https://doi.org/10.1007/BF00242104
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DOI: https://doi.org/10.1007/BF00242104