When water is used as the solvent, the inter-ionic forces are appreciable. Hence the molar conductance is directly related with the solute, ion-solvent molecular interactions or ion–solvent interactions. The study of internal pressure in liquid mixture provides a wealth of information about the liquid state. The internal pressure of the solution is a single factor which varies due to all the internal interactions like hydration, ion-solvent interactions, quantum mechanical forces of dispersion and dielectric constant effect. Therefore ion-solvent interaction in liquid can be explained by using internal pressure as well as conductance. In the present study, the aqueous solutions of sodium-4-amino-2-hydroxy benzoic acid dihydrate are taken and ultrasonic waves are propogated through the solution for different concentrations in the temperature range of 298.15K to 308.15K and the ultrasonic velocity through the solution is measured along with density and viscosity. Conductance of the solution is measured for the above concentration and temperature range. The variations of electrolytic conductance and internal pressure with temperature and concentration are studied.
