Raman spectra of aqueous solutions of hydrogen sulfite ion (SHO<sub>3</sub><sup>-</sup>) 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 HOSO<sub>2</sub><sup>-</sup> isomer has a peak at 1023 cm<sup>−1</sup> and the HSO<sub>3</sub><sup>-</sup> isomer has a peak at 1052 cm<sup>−1</sup>. The relative strengths of the peaks were determined and used to measure the equilibrium quotients for hydrogen sulfite ion. <i>Q</i><sub>1</sub> = [HOSO<sub>2</sub><sup>-</sup>]/[HSO<sub>3</sub><sup>-</sup>] <i>Q</i><sub>2</sub> = [S<sub>2</sub>O<sub>5</sub><sup>2-</sup>]/SHO<sub>3</sub><sup>-</sup>]<sup>2</sup> No evidence was found for a hydrogen sulfite dimer other than disulfite ion, S<sub>2</sub>O<sub>5</sub><sup>2-</sup>.

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