Abstract
Mean activity determinations from EMF data of CdCl 2, PbCl 2, Ag 2SO 4, Tl 2SO 4, and TIF in solutions containing variable amounts of NaClO 4 (1–16 M) show partly a considerable increase, partly a strong decrease of the mean activity coefficients with increasing NaClO 4 concentrations EMF measurements at cells with transference give evidence for these anomalies to be due to predominant change in the activity of the cations. The activities of the anions, especially Cl −, appear to remain approximately constant. It is pointed out that difficulties in explanations are mainly due to the poor knowledge about the true concentrations of ions caused by eventual ion pair formation, hydrolysis etc.
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