Abstract
The equilibrium between bisulfite ion and pyrosulfite ion in aqueous solutions of different ionic strengths was investigated spectrophotometrically. Values for the equilibrium constant at ionic strengths of 2.0, 0.9, 0.5, 0.1, and 0.01 M were found to be 0.34, 0.22, 0.175, 0.115, and 0.086 M-1 respectively. The extrapolated thermodynamic equilibrium constant was calculated to be 0.076 ± 0.010 M−1, and the molar absorptivity of pyrosulfite ion at 255nm was calculated to be 1980. These values differ significantly from the values in the chemical literature. No evidence was found for the formation of complexes between bisulfite and citrate ions in aqueous solution.
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