Ultrasonic Absorption in MgSO4 Solutions as a Function of Pressure and Dielectric Constant

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Abstract
Measurements in the 100- to 500-kc/sec region have been made of ultrasonic absorption as a function of pressure and dielectric constant for 0.5 M solutions of MgSO4. Relaxation frequencies, reaction rates, and sound velocities are calculated from the results. The magnitude and pressure dependence of the chemical compressibility for aqueous solutions are in good agreement with the four-state dissociation model proposed by M. Eigen and K. Tamm [Z. Elektrochem. 66, 93–107, 107–121 (1962)] to explain ultrasonic absorption at atmospheric pressure. Furthermore, it is pointed out that the effect of pressure on the equilibrium dissociation constant for aqueous solutions at low concentration, predicted with the same four-state model, is shown to be in excellent agreement with electrical-conductivity data as a function of pressure. No explanation of the unusual effects observed for ultrasonic absorption and relaxation frequency at lower dielectric constants can be made at this time.

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