Aqueous nicotine solutions: PH-measurements and salting-out effects - Analysis of the effective Gibbs energies of hydration and ionic strengths of the solutions

Nikola D. Grozdanic, Marta S. Calado, Mirjana Lj Kijevcanin, Slobodan P. Serbanovic, Zoran P. Višak*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

This work is a continuation of previous studies on phase demixing - salting-out effects - in aqueous nicotine solutions. Thus, pH measurements were performed, allowing a brief analysis of the existing hydrogen bond interactions. Salting-out effects - the related experimental cloud point shifts - provoked by the addition of two inorganic salts, potassium nitrate and sodium sulfate, which have not hitherto been studied, were determined. Analysis of the current and previously reported salting-out/or salting-in phenomena in nicotine aqueous solutions was performed. In this respect, five studied salts were included: four inorganic salts (sodium chloride, potassium nitrate, sodium sulfate and trisodium phosphate (Na3PO4)), and ionic the liquid 1-ethyl-3-methylimidazolium ethyl sulfate ([C2mim][EtSO4], commercial name ECOENG212®). Based on pH measurements, the effective Gibbs energies of hydration and the ionic strengths of the respective ternary solutions were calculated and plotted against the related cloud-point shifts caused by the addition of the salts. For the studied salts, the results and diagram obtained within this work may be used to predict the cloud-points shifts, based on the related quantities of the salts added and/or the molar Gibbs energies of hydration and/or ionic strengths requested in each case.

Original languageEnglish
Pages (from-to)829-842
Number of pages14
JournalJournal of the Serbian Chemical Society
Volume79
Issue number7
DOIs
Publication statusPublished - 2014

Bibliographical note

Creative Commons Attribution Non-Commercial No-Derivative Works 3.0 License

Keywords

  • Inorganic salts
  • Ionic liquids
  • PH measurements of solutions

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