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Transference Number and Conductance Studies of Sodium Chloride in 20 Mass. % Ethanol + Water, and 20 Mass. % Formamide + Water Mixture at 298.15 K

Transference numbers of sodium chloride were determined at 298.15 K from the potential difference (pd) measurements of the cell with liquid junction: Ag(s)/AgCl(s)/NaCl (Z, m1)/NaCl (Z, m2)/AgCl(s)/Ag(s), at various salt molalities (m1 > m2) in 20 mass. % mixture (Z) of ethanol or formamide with water by using literature date for the activity coefficient ; two organic solvents influence the mixture permitivity inversly. Molar conductivities of NaCl were determined in both mixtures and treated by the Lee-Wheaton equation to obtain their limiting value (Lo). Limiting transference number (to) of the sodium ion, obtained by extrapolation to zero-molality, serves to derive ionic conductivities (lo+, lo–) from Lo. Results are compared with that in similar systems and discussed.

transference number; ionic conductance; aqueous formamide; aqueous ethanol; sodium chloride

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