Study of Ultrasonic Velocity and Adiabatic Compressibility and Related Parameters in Electrolytic Solutions

Ultrasonic velocities in aqueous solutions of metallic iodides belonging to (1.1) and (2.1) valence types have been determined at different dilutions and in the temperature range of 35 °C to 55 °C, at every five degrees interval using a variable path acoustic interferometer. Decrease of velocity V with increase in concentration C has been observed and explained by taking into account the nature of the constant G in the relation V = V ₀ + G C — H C ^3/2. The computations of values of G from the above expression have been made previously by neglecting the term H C ^3/2. In the present observations it has been found that H has a finite value and hence its contribution to the value of V at any concentration C is noticeable. The nature of variation of V with temperature at any concentration has been shown. The constants G and H have been evaluated at different temperatures.

Variation of adiabatic compressibility β with molar concentration has been discussed for the same set of electrolytes. The Bachem's relation has been analysed in terms of these data to evaluate A and B, the related constants. Variation of β with temperature for any particular concentration has been analysed.