Summary
Various methods yield a value of 6.3 · 10−13 for the apparent k1 and ∼ 4 · 10−15 for K2 of osmium(VIII) acid at 298 K. Spectrophotometric and potentiometric measurements yielded approximate values for the acidic constants of osmium(VI) acid: 3.2 · 10−9 and 4.0 · 10−11. The dependence of the pH of solution on the potassium osmate(VI) concentration can be interpreted in terms of the base inclusions in the preparation, rather than in terms of the dimerization of the osmium(VI).
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Galbács, Z.M., Zsednai, Á. & Csányi, L.J. The acidic behaviour of osmium(VIII) and osmium(VI). Transition Met Chem 8, 328–332 (1983). https://doi.org/10.1007/BF00618563
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DOI: https://doi.org/10.1007/BF00618563