Abstract
The mean ionic activity coefficients for sodium chloride in the NaCl+H2O binary system have been experimentally determined at 298.15 K, from electromotive force measurements of the cell: $$(-)\,\mathrm{Pt}|\mathrm{Ag}|\mathrm{AgCl}|\mathrm{NaCl}(\mathrm{m}_{2})\|\mathrm{NaCl}(\mathrm{m}_{1})|\mathrm{AgCl}|\mathrm{Ag}|\mathrm{Pt}\,(+)$$ The electrolyte molality, m, ranged from 0.01 to 3 mol⋅kg−1. The measurements of electromotive force were carried out on solutions containing pure water as solvent, or a mix of water and “extremely diluted solutions” (EDS), obtained using the iterative procedure of successive dilutions and succussions of Homeopathic Medicine, at the same concentration of sodium chloride. The measurements of the mean activity coefficient of sodium chloride, on the solutions containing the EDS, showed evidence of some relevant differences compared to those with just water as solvent. In the performed experiments, the differences in electromotive force between the two systems must be attributed substantially to a difference in the activity of the solute between the two solvents.
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