Author/Authors :
Arfin، Tanvir نويسنده Chemical Resource Beneficiation (CRB) Research Focus Area, PGM Group, North-West University, Private Bag X6001, Potchefstroom 2520, South Africa , , Bushra، Rani نويسنده Analytical Research Laboratory, Department of Chemistry, Faculty of Science, Aligarh Muslim University, Aligarh 202002, India , , Kriek، Roelof J. نويسنده PGM Group, Chemical Resource Beneficiation (CRB) Research Focus Area, North-West University, Private Bag X6001, Potchefstroom 2520, South Africa ,
Abstract :
In continuation to our previous work with composite polyaniline-zirconium (IV)-
arsenate (PZA), we further extended with the conductivity measurements in this report. All
the calculations reported in here were extracted from the experiments carried out in the
temperature range of (25-50)±0.1°C and at different concentrations (0.01?C(M)?1) of KCl,
NaCl and LiCl 1-1 electrolyte solutions. The diffusion coefficient for 1-1 electrolyte solutions
was found to decrease in the order K+ > Na+ > Li+, which is in accordance with a decrease in
the size of cation. The resistance is decreasing with increasing time in the order Li+ > Na+ >
K+, and is due to an increased size of the cation for the chosen electrolytes. From the results,
the conductivity values for 1-1 electrolytes in the membrane phase were found to be higher at
the lower concentration for all the electrolytes in the order of Li+ > Na+ > K+. It was observed
that the conductivity found to be increased with an increase of temperature and obeyed the
Arrhenius equation. The activation energy increased with an increased concentration of
electrolyte solution and the sequence for the energy of activation is Li+ > Na+ > K+. The Gibbs
free energy, enthalpy and entropy for the ions were calculated at different concentrations and
temperatures. All the values of ?G, ?H, and ?S were found to be positive in nature and are
following the order K+ > Na+ > Li+.
