The speed of sound, electrical conductivity, viscosity, surface tension, and Raman spectra of aqueous zinc nitrate solutions were measured from dilute to very high concentrations as a function of temperature (273.15 ≤ T /K ≤ 323.15). Isentropic compressibility isotherms converge at 2.18 mol·kg -1 and provide crucial structural information regarding ion hydration. At the converging concentration, 26.3 water molecules are rigidly bound in the primary hydration shell of Zn 2+ and NO 3 - ions. The hydrated Zn 2+ and NO 3 - ions up to 2.2 mol·kg -1 and beyond 2.2 mol·kg -1, solvent-separated and/or solvent-shared ion pairs govern the transport properties.
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Wahab et al. (2003) studied this question.
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