2010
DOI: 10.1021/je100121u
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Activity Coefficients of NaCl in Aqueous Mixtures with High Relative Permittivity Cosolvent: Ethylene Carbonate + Water at 298.15 K

Abstract: The mean ionic activity coefficients of NaCl were experimentally determined in ethylene carbonate (EC) + water at 298.15 K from potential difference measurements of the following electrochemical cell containing two ion-selective electrodes (ISEs):The molality (m) varied between 0.02 mol • kg -1 and almost saturation, while the mass fraction of EC in the mixture (w) was varied between 0 and 0.8 in 0.1 unit steps. Values of the standard potential difference, E 0 (molal scale), were determined using a routine met… Show more

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Cited by 20 publications
(28 citation statements)
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“…In addition, the k values for the binary system with water are larger than those with alcohols. The electric conductivity decreases with the decreased solvent permittivity (ε r ) in the following order: water (ε r = 78.38) > methanol (32.64) > ethanol (24.55). The polarity of water is much higher than that of alcohols as well with the order of water (10.2) > methanol (6.6) > ethanol (4.3), thus the electrolyte is easier to dissociate into ions in water, facilitating the charge movement, and eventually, the electrical conductivity is elevated.…”
Section: Results and Discussionmentioning
confidence: 99%
“…In addition, the k values for the binary system with water are larger than those with alcohols. The electric conductivity decreases with the decreased solvent permittivity (ε r ) in the following order: water (ε r = 78.38) > methanol (32.64) > ethanol (24.55). The polarity of water is much higher than that of alcohols as well with the order of water (10.2) > methanol (6.6) > ethanol (4.3), thus the electrolyte is easier to dissociate into ions in water, facilitating the charge movement, and eventually, the electrical conductivity is elevated.…”
Section: Results and Discussionmentioning
confidence: 99%
“…For example, Lopes et al 3 obtained mean activity coefficients of NaCl in ethanol-water mixtures. Hernández-Luis et al 4,5 investigated the activity coefficients for NaCl in ethylene carbonate/PEG 4000-water mixtures at 298.15 K. Zhuo et al 6 investigated the activity coefficients for NaClmonosaccharide (D-glucose, D-galactose, D-xylose, D-arabinose)-water systems at 298.15 K, moreover they determined activity coefficients for NaBr in aqueous D-trehalose/D-cellobiose solutions at 298.15 K. 7 Dinane et al 8 calculated the activity coefficients of NaCl in MgCl 2 -water system.…”
Section: Introductionmentioning
confidence: 99%
“…Moreover, the variation trend of ( a – q ) with the reciprocal of the relative permittivity is lightly decreased. This phenomenon is the same as that in system NaCl/NaF + EC + H 2 O , but different from that in CsBr + MeOH/EtOH + H 2 O systems …”
Section: Discussionmentioning
confidence: 47%
“…In the literature, there are numerous studies of alkali halides in organic–water mixtures by potential difference measurements, for example, KCl and NaCl in ethanol–water, , NaCl/NaF in methanol/ethanol–water, , NaF/NaCl/NaBr in fomamide–water, NaF/NaBr/NaCl in ethylene carbonate–water, NaCl/KCl/LiCl in PEG 4000-water. However, only a few studies are cited in the literature that describe the mean activity coefficients of alkali halides in ternary mixed solvents from potentiometric data …”
Section: Introductionmentioning
confidence: 99%