Characterization of potassium chloride as an equitransferent "intersolvental" salt bridge
Manzoni, A; Mussini, PR; Mussini, T
| HERO ID | 1177135 |
|---|---|
| In Press | No |
| Year | 1999 |
| Title | Characterization of potassium chloride as an equitransferent "intersolvental" salt bridge |
| Authors | Manzoni, A; Mussini, PR; Mussini, T |
| Journal | Journal of Solution Chemistry |
| Volume | 28 |
| Issue | 12 |
| Page Numbers | 1329-1340 |
| Abstract | The electromotive forces (emF) E-A and E-C of the following concentration cells with transference: Ag/AgCl/KCl(m(2))parallel to KCl (m(1))\AgCl\Ag and KxHg1-x\KCl (m(1))parallel to KCl (m(2))\KxHg1-x, respectively, together with the emfs E-MAX of the corresponding double cell without transference: KxHg1-xKCl (m(1))\AgCl\Ag-Ag\AgCl\KCl (m(2))\KxHg1-x have been measured at KCl molalities m (m(1) fixed and m(2) varied, with m(2) > m(1)) approximately up to the KCl solubility limit in 12 solvent mixtures for the three aqueous-oganic solvent systems (ethylene glycol + water),(acetonitrile + water), and (1,4-dioxane + water) up to 0.8 mass fraction of organic component. For all the cases explored, the E-A vs. E-MAX relation is linear over the whole KCI molality range. The ionic transference numbers tof KCI determined therefrom show a curvilinear dependence on the mass fraction of the organic component of the relevant solvent mixture and are found to fall in the range 0.52-0.48, viz, within +/-4% of exact equitransference (t(+) = t(-) = 0.5). In particular, KCI becomes exactly equitransferent (i.e., an ideal salt bridge) in aqueous mixtures with the following mass fractions of organic component: 0.4 ethylene glycol and 0.09 acetonitrile, as well as 0.12 methanol, and 0.08 and 0.34 ethanol from our recent work. Even if use of KCI as a salt bridge would be somewhat restricted by its limited solubility in high mass fractions of dioxane and acetonitrile and pending extension of investigation to other mixed-solvent systems, the above figures characterize KCI as a fairly good "intersolvental" salt bridge in electrochemistry, electroanalysis, and corrosion science. |
| Doi | 10.1023/A:1021748008137 |
| Wosid | WOS:000083887300005 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Source: Web of Science 000083887300005 |
| Is Public | Yes |
| Keyword | transference cells; transference numbers; salt bridges; mixed solvents |
| Is Qa | No |