Abstract
Raman spectra are presented for aqueous ammonium bisulfate and zinc sulfate-sulfuric acid solutions over a wide range of concentration and from 20 to 85°C. The heights of the 980 cm−1 (primarily SO −24 ) and 1053 cm−1 (primarily HSO −4 ) bands are correlated with the pH of the solutions. The ratio of the species SO −24 and HSO −4 can be obtained from the ratio of scattering intensities at 980 and 1053 cm−1. The ΔH obtained from plots of the log of the concentration products versus 1/T is −37±5 kJ-mol−1 for ammonium bisulfate solutions and −48±4kJ-mol−1 for the ZnSO 4 -H 2 SO 4 solutions. This compares to −22 kJ-mol−1 for the ΔH of bisulfate ion dissociation as obtained from thermodynamic equilibrium constants.
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Kruus, P., Hayes, A.C. & Adams, W.A. Determination of ratios of sulfate to bisulfate ions in aqueous solutions by Raman spectroscopy. J Solution Chem 14, 117–128 (1985). https://doi.org/10.1007/BF00648900
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DOI: https://doi.org/10.1007/BF00648900