The Electric Conductivities of Aqueous Solutions of Rubidium and Cesium Cyclohexylsulfamates, Potassium Acesulfame and Sodium Saccharin
Darja Rudan-Tasič1, Cveto Klofutar1, Marija Bešter-Rogač2*
1Biotechnical Faculty, University of Ljubljana, SI-1000 Ljubljana,
Slovenia.
2Faculty of Chemistry and Chemical Technology, University of
Ljubljana, SI-1000 Ljubljana, Slovenia.
Absrtract
The electric conductivities of aqueous
solutions of rubidium and cesium salts of cyclohexylsulfamic acid, potassium
acesulfame and sodium saccharin were measured from 5 °C to 35 °C (in steps of 5
°C) in the concentration range 0.0003 < c/mol dm-3 < 0.01. Data
analysis based on the chemical model of electroyte solutions yielded the
limiting molar conductivity Λ∞
and the association constant KA.
Using the known data of the limiting conductivities of rubidium, cesium, sodium
and potassium ions the limiting conductivities of the cyclohexylsulfamate,
accesulfame and saccharin ions were evaluated. Total dissociation of the
investigated salts in water and negligible hydration of anions are evident.
Key words: electrolyte conductivity, electrolyte solution, cyclohexylsulfamates, acesulfame, saccharin, chemical model