Raman Spectral Studies of Aqueous Solutions of Selenious Acid

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Abstract
Photoelectric Raman spectra of aqueous solutions of selenious acid, obtained at various concentrations, and of dilute strongly alkaline and partially neutralized aqueous mixtures of sodium hydroxide and selenious acid, have yielded vibrational frequencies considered to be those of the species H2SeO3, SeO32—, and HSeO3—, respectively. In aqueous solutions of selenious acid, the intensities of two strong bands were found to increase linearly with (stoichiometric) concentration over a wide range of concentrations. This fact suggests essential completeness in the reaction of SeO2 with water, and negligible dissociation of H2SeO3 into its ions, in the solutions for which linearity is obtained. Polarization studies of the various Raman bands, comparisons of the observed frequencies with those of molecules of known symmetry, intercomparisons of the frequencies of the species SeO32—, HSeO3—, and H2SeO3, and information gained from reported x‐ray studies of solid selenious acid have allowed for provisional vibrational assignments on the assumptions of various symmetries.

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