TRANSFERENCE NUMBERS OF NACL IN AQUEOUS MIXTURES WITH ORGANIC-SOLVENTS OF MODERATE TO LOW PERMITTIVITIES

Citation
Pd. Ceccattini et al., TRANSFERENCE NUMBERS OF NACL IN AQUEOUS MIXTURES WITH ORGANIC-SOLVENTS OF MODERATE TO LOW PERMITTIVITIES, Journal of solution chemistry, 27(1), 1998, pp. 1-16
Citations number
26
Categorie Soggetti
Chemistry Physical
ISSN journal
00959782
Volume
27
Issue
1
Year of publication
1998
Pages
1 - 16
Database
ISI
SICI code
0095-9782(1998)27:1<1:TNONIA>2.0.ZU;2-#
Abstract
Electromotive forces (emf) were measured in the transference cells: Ag \AgCl\-NaCl (m(2)) in Z\\ NaCl (m(1)) in Z\AgCl\Ag and NaxHg1-x\NaCl ( m(1)) in Z\\ NaCl (m(2)) in Z\NaxHg1-x (where NaxHg1-x denotes a flowi ng Na-amalgam electrode and Z an aqueous-organic solvent mixture) at v arious molalities m(2) > m(1) of NaCl in Z = (ethylene glycol + water) , (acetonitrile + water) and (1,4-dioxane + water), with mass fraction s of the organic components less than or equal to 0.8. The transferenc e number of Na+ in (ethylene glycol + water) and (1,4-dioxane + water) varies little with respect to that in pure water medium, whereas in ( acetonitrile + water) it increases remarkably with increasing proporti on of acetonitrile so as to approach equitransference, behavior simila r to that previously found in (methanol + water) and in (ethanol + wat er). At acetonitrile mass fraction 0.6 NaCl is sufficiently close to e quitransference to emerge as a useful salt bridge, nearly at the same level as the popular aqueous KCl.