Electromotive Force Measurements and Thermodynamic Modelling of Sodium Chloride in Aqueous-Alcohol Solvents

Uspenskaya, I. A.; Konstantinova, Natalia; Veryaeva, E. S.; Mamontov, M. N.

doi:10.5772/31247

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2011

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“…Both electrodes were calibrated upon measurements; their functional correctness was proved as described in ref . In the beginning of each experiment, the EMF of the investigated cell, which did not contain crown ether, was measured, and the calibration plots of E versus ln( m Na + 0 m Cl – 0 ) were constructed (the superscript 0 indicates that a complex-forming agent was absent in the solution).…”

Section: Methodsmentioning

confidence: 99%

Stability Constants for the 18-Crown-6–Sodium Ion Complex in Mixtures of Water and Butan-1-ol or Butan-2-ol

2011

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The complex formation constants of sodium ions with 18-crown-6 in mixtures of water and butan-1-ol or butan-2-ol at 298.15 K were determined by the potentiometric method with the use of sodium and chloride ion-selective electrodes. The correlations between the logarithm of the complex formation constants and the mole fraction of an alcohol in the mixed solvent were constructed based on the published data and the experimental results obtained in the present study. It was shown that the numerical value of the constant is to a great extent determined by the water-to-alcohol ratio and is virtually independent of the nature of the alcohol. The proposed correlations are suitable for the estimation of the stability constants of 18-crown-6 with sodium, potassium, and thallium ions in mixed aqua-alcohol solvents.

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Section: Methodsmentioning

confidence: 99%