Physico-chemical study of aqueous and non-aqueous solutions of electrolytes and non-electrolytes

Abstract

Viscosity, density and conductivity of different solutions of NaCI, Ket, Hexamethylene letramnine (HMTA), and Hydrazinc in methanol and water solvents have been measured at different temperature (20, 25. 30, 35, & 40°C). From the experimental values of viscosity and density, apparent specific volume, 8-coefficient of Jones-Dole equation, ~HTI#' b.GTI# and T6Sn" were calculated The decrease of app<lrent specific volume was morc influenced by KCl than by NaCI, particularly at higher concentration of solutes The value of lp was almost unchanged in case of 'CH10H + Hydrazine' but the change in value of <Din case of 'CH,OH + HMTi\' was observable which has been explained. ThIS explained the IIltle dYecl of Hydrazine in structure fanning and breaking of aqueous solution, Positive values of 8-coefficient were obtained for all solutions except for the aqueous solulton of 'KCl + HMTA' and especially at lower tcmperature (20~30°C) for the solution of 'KCI +Hydrazine'. The values of f',H'l~were mcreased with the increasing concentration of NaCl but decreased with the increasing concentration of KCl. Howevec the extcllt or snch changes werc decreased in the presence ofHMTA and slightly enhanccd in the presence of Hydrazine, The structure intcnsifying and structurc destroying effect of NaCl and KCl respectively were observed from the values of t::.Gt However, both the effects were found to be reduced at higher temperature. The values of f',G~#for both the solutions having 'methanol + HMTA. and 'methanol +Hydrazine' were increased with the increase of concentration. Similar results were also observed in the values of Tf',S/ The conduc)ance data have been analyzcd by lIsmg Dcbyc-l-luckel-Onsager condnctance equation and 'Walden rule' in terms of limiting molar conductance (All), degree of dIssociation (a), '(AI/\.o) + B' value and 'Walden Product' (/\.111111). nle .Walden Product' values were cxplamed in tCllllS 01.Stoke's molecular radius. The conductivity -study shown the structure intcnsifying ability of NaCl and KCl in presence or HMTA or Hydrazine in illlxed solvents of CH,OH and H20, The calculated data of 'Walden Product' shown the less structure intensification ahility of NaCl and KCI in presence of Hydrazine than in the presence of HMTA 111 mixed solvents, All the results were cxplained on the basis of interactions between the dim~rent nature of particles present in the solution,