Authors: Raji Heyrovska
Electrochemical potentials are conventionally referred to that of the standard hydrogen electrode (SHE) arbitrarily as zero, in the absence of the knowledge of the latter. More than two centuries after Volta, the author demonstrated for the first time, a new simple linear relation between the gaseous ionization potentials (I) and the aqueous standard redox potentials using existing data for the elements of various Groups in the Periodic Table. All these straight lines (except for Gp. VII) converged to one point at I = 0, yielding the absolute potential of SHE as 4.20 (+/- 0.03)V. For halogens (Gp. VII), the value was found to be 2.87 (+/-0.01) V. This enabled converting the existing standard potential data into absolute potentials. Since the gaseous ionization potentials are inversely proportional to the Bohr radius, an extension of the idea to absolute aqueous redox potentials enabled estimating the radii of redox components in solution and correlating them with their covalent radii.
Comments: 5 pages
[v1] 2016-03-10 13:50:13
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