Abstract
FOR a given oxidation level the oxy-acids in a given sub-group of the periodic table are normally found to exhibit a regular variation in acid strengths. In group VII, for example, Cobble1 lists the logical pK values as −2.25, (−1.5) and −1.25 for HMnO4, HTcO4 (estimated, with due regard for the lanthanide contraction) and HReO4. The general behaviour of pertechnic acid in aqueous neutralimetry certainly is consistent with that of a monoprotic and ‘relatively’ strong acid.
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References
Cobble, J. W., in Kolthoff and Elving, Treatise on Analytical Chemistry, Part 2, 6 (Interscience–Wiley, New York, 1963).
Kertes, A. S., and Beck, A., Proc. Seventh I.C.C.C., Stockholm, 352 (June 1962).
Salaria, G. B. S., Rulfs, C. L., and Elving, P. J., J. Chem. Soc. and Anal. Chem. (in the press), and unpublished results.
Rulfs, C. L., Hirsch, R. F., Pacer, R. A., and Kitson, D. A. (unpublished results).
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RULFS, C., HIRSCH, R. & PACER, R. Pertechnic Acid : an Aperiodic Variation in Acid Strength. Nature 199, 66 (1963). https://doi.org/10.1038/199066a0
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DOI: https://doi.org/10.1038/199066a0
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