Abstract
From e.m.f. measurements of the reversible cell H2 (1 bar) |NaOH(aq)|HgO|Hg at temperatures between 283 and 363 K, the standard potential of the mercuric oxide electrode has been redetermined; its new observed value at 298.15K is 0.926 99 V (acid scale) or 0.09900 V (basic scale). New values of the related Gibbs energies, enthalpies and entropies for the cell reaction and mercuric oxide, HgO, have been calculated therefrom. From literature data for the cell Hg|HgO|NaOH-(aq)|Ag2O|Ag the standard potential of the silver oxide electrode at 298.15 K has also been redetermined as 1.1713 V (acid scale) or 0.3433 V (basic scale). In parallel, the solubility product constants at 298.15 K for Hg(OH)2 and for AgOH have been redetermined as 3.13×10−26 and 1.959×10−8, respectively. Applications of the mercuric oxide electrode are discussed.
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Longhi, P., Mussini, T., Orsenigo, R. et al. Redetermination of the standard potential of the mercuric oxide electrode at temperatures between 283 and 363 K and the solubility product constant of mercuric hydroxide. J Appl Electrochem 17, 505–514 (1987). https://doi.org/10.1007/BF01084124
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DOI: https://doi.org/10.1007/BF01084124