EFFECTS OF PRESSURE AND DIELECTRIC CONSTANT ON SOUND ABSORPTION IN MAGNESIUM SULFATE SOLUTIONS
Abstract
The simple dissociation model proposed by Bies (J. Chem. Phys. 23:428, 1955) to explain acoustic absorption in MgSO4 solutions does not give a complete quantitative description of experimental results in aqueous and dioxane-water solvents at atmospheric pressure. An attempt was made to explore the reasons for the failure of Bies' theory by measuring acoustic absorption as a function of pressure in MgSO4 solutions with two values for the dielectric constant. At the high concentration used, 0.5 M, a change in the dielectric constant from D = 78.5 (water) to D = 56.5 (25% dioxane-water) was accompanied by negligible changes in the magnitude and pressure dependence of the absorption. This behavior, together with that observed by Bies at low concentrati ns and atmospheric pressure, is consistent with the existence of an intermediate reaction, before dissociation, which is responsible for acoustic absorption. Velocity as a function of pressure, and the relaxation frequency at atmospheric pressure, are given for the 25% dioxane-water solution. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1962
- Accession Number
- AD0274814
Entities
People
- Frederick H. Fisher
Organizations
- Harvard University