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Transference Numbers of Sodium Chloride in Formamide + Water Mixtures at 298.15 K from Potential Difference Measurements

Transference numbers of sodium ion constituent were determined at 298.15 K from the potential difference (pd) measurements of the cell with liquid junction: Ag(s)/AgCl(s)/NaCl (m):NaCl (mref.)/AgCl(s)/Ag(s), at various sodium chloride molalities (m) against fixed molality (mref.) in aqueous mixtures with different mass fraction of formamide (wF = 0.20, 0.40, 0.60, and 0.80) by using literature data for the activity coefficient. Limiting transference number of the sodium ion, obtained by extrapolation to zero-molarity, serves to derive ionic conductivities. Results are compared with that in similar systems and discussed in terms ion solvation.

transference numbers; sodium chloride; formamide + water mixtures; potentiometry

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