Abstract

Raman spectra of aqueous solutions of hydrogen sulfite ion (SHO₃^-) were collected over temperatures of 275 to 340 K. The change in peak intensities with temperature was used to assign peaks to the hydrogen sulfite isomers. The HOSO₂^- isomer has a peak at 1023 cm⁻¹ and the HSO₃^- isomer has a peak at 1052 cm⁻¹. The relative strengths of the peaks were determined and used to measure the equilibrium quotients for hydrogen sulfite ion. <i>Q</i>₁ = [HOSO₂^-]/[HSO₃^-] <i>Q</i>₂ = [S₂O₅^2-]/SHO₃^-]² No evidence was found for a hydrogen sulfite dimer other than disulfite ion, S₂O₅^2-.

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