Conductance and transference number measurements of some 1:1 electrolytes in acetic acid + water mixtures at 25°C

Abstract

Molar conductances of some 1:1 alkali metal and tetraalkylammonium

salts and silver nitrate have been measured in acetic acid + water mixtures containing 0, 20, 40, 60, 80 and 90 wt% acetic acid at 25°C. The conductance data have been analysed by Shedlovsky method setting ion-size parameter equal to Bjerrum critical distance suggested by Justice to calculate Λ₀ and K_A.

Transference numbers of NO₃^- ion in AgNO₃ have also been measured in water and acetic acid + water mixtures containing 20, 40, 60, 80 and 90 wt % acetic acid by modified Hittorfs method and e.m.f method. The limiting transference numbers to <b>t</b>⁰_NO3-have been combined with Λ₀values of AgNO₃ to obtain limiting ionic conductances, λ⁰_Ag⁺ and λ⁰ _NO3- and these values have been further used to calculate limiting ionic molar conductances of all other ions using Kohlrausch law. These studies suggest the solvation pattern in acetic acid + water mixtures as : Li⁺ > Na⁺ >Ag⁺ > K⁺> NH₄⁺ and BPh₄^- > CH₃COO^- > Cl^->Br^- > NO₃^-.