Electrical conductivity, speeds of sound, and viscosity of aqueous ammonium nitrate solutions

Density, electrical conductivity, speeds of sound, and viscosity of aqueous ammonium nitrate solutions were measured as functions of concentration (m, mol kg(-1)) (0.1599 less than or equal to m less than or equal to 20.42) a nd temperature (T, K) (273.15 less than or equal to T less than or equal to 323.15). Experimental values are consistent with the reported data. Variat ion of isotherms of electrical conductivity, isentropic compressibility, an d structural relaxation time with concentration evoke structural informatio n on the ion solvation in aqueous ammonium nitrate solution at different co ncentration regions. The primary hydration numbers of ammonium nitrate were estimated at a particular concentration at which the isentropic compressib ility isotherms converge. The existence of free hydrated ions, resulting fr om strong ion solvent interactions in dilute to 9.1 mol kg(-1), the solvent -separated ion-pairs resulting from the relative competition between the io n-solvent and the ion-ion interactions in 9.1 to 12.0 mol kg(-1), and the s olvent-shared ion-pairs beyond 12.0 mol kg(-1) resulting from a decrease in the number of solvent molecules, govern the transport process.