Conductivity Behaviour of BiI_3 in MeCN+DMF and MeOH+DMF A Qualitative Study

摘要

The results obtained in the investigation of the behaviour of BiI_3 species in MeCN/MeOH+DMF in the temperature range of 288K-318K have been discussed in this paper. Using the electrical conductivity principle, in solution, the limiting molar conductance was estimated and it is found to vary in the order of MeCN>MeOH>DMF. The limiting molar conductance decreased continuously for the added amount of DMF either to MeCN or MeOH. The conductivity models used give the dissociation and association constants. These data helped in the prediction of endothermic behaviour of the process in most of the percent compositions. Thermodynamic parameters of association, energy of activation, the Walden product and thermodynamics of solvation are computed and presented in this paper. The ion-pair formation constant K_p and triple ion formation constant K were also calculated. From this data, the conclusion was made that BiI_3 species found to be unstable for the added DMF to MeCN or MeOH.