Abstract
The Raman spectra of the v1-SO 2−4 band in 0.5–2.5 molar aqueous (NH4)2SO4 and ZnSO4 solutions in the temperature range 25–85°C were studied. The molar scattering coefficient of the v1 band is the same for all forms of sulfate in (NH4)2SO4 and ZnSO4 solutions and is independent of temperature up to 85°C. The v1 band profile is symmetrical in (NH4)2SO4 solutions. In ZnSO4 solutions, a shoulder appears on the high frequency side which increases slightly in intensity with increasing concentration and temperature. This high frequency component is attributed to the formation of the contact ion pair (Zn2+·SO 2−4 ). The enthalpy of formation for the contact ion pair is estimated from the Raman data to be approximately 3 kJ-mol−1 which is in reasonable agreement with measurements by other methods.
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Hayes, A.C., Kruus, P. & Adams, W.A. Raman spectroscopic study of aqueous (NH4)2SO4 and ZnSO4 solutions. J Solution Chem 13, 61–75 (1984). https://doi.org/10.1007/BF00648592
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DOI: https://doi.org/10.1007/BF00648592