Determination of ratios of sulfate to bisulfate ions in aqueous solutions by Raman spectroscopy |
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| Authors: | Peeter Kruus A Catherine Hayes William A Adams |
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| Institution: | (1) Department of Chemistry, Carleton University, K1S 5B6 Ottawa, Canada;(2) Department of National Defence, Defence Research Establishment Ottawa, K1A 0Z4 Ottawa, Ontario |
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| 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
4
–2
) and 1053 cm
–1
(primarily HSO
4
–
) bands are correlated with the pH of the solutions. The ratio of the species SO
4
–2
and HSO
4
–
can be obtained from the ratio of scattering intensities at 980 and 1053 cm
–1
. The  H 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 H of bisulfate ion dissociation as obtained from thermodynamic equilibrium constants. |
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| Keywords: | Zinc sulfate ammonium bisulfate sulfuric acid pH Raman spectra speciation |
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