Investigation of Thermodynamic Properties of the Ternary Electrolyte System Based on Pitzer Model at T=۲۹۸.۱۵

In this work, the results relating to the thermodynamic properties for the ternary solutions of [CoCl۲ + Co(NO۳)۲](aq) using the potentiometric method and based on Pitzer ion interaction model are reported at ۲۹۸.۱۵ K. The Pitzer model is one of the most famous and useful models in electrolyt solutions [۱-۲]. This paper is a continuation of the research on ternary aqueous electrolyte solutions [۳]. The potentiometric measurements reported in this work were carried out with a galvanic cell containing a solvent polymeric membrane Co۲+- ion selective electrode (Co۲+-ISE) and Ag-AgCl electrode and various series of this mixed salt electrolyte system, at ionic strengths of ۰.۰۰۱ to ۶.۰۰۰ mol.kg-۱. A series of concentrated mixed electrolyte solutions, characterized by their molal salt ratio (r = ۱.۰۰, ۲.۵۰, ۵.۰۰, ۷.۵, ۱۰.۰۰, ۱۵.۰۰) was used in a standard addition technique to modify the molality of the mixed electrolyte in the experimental cell.

کلیدواژه ها:

Thermodynamic properties ، CoCl۲ ، Co(NO۳)۲ ، Pitzer model ، Potentiometric method