Abstract
Electromotive-force measurements of cells without transference were used to determine the dissociation constant of the protonated form of the weak base 2-amino-2-methyl-1, 3-propanediol (Bis) in synthetic seawaters corresponding to salinities of 20, 35, and 45‰. Hydrogen electrodes and silver-silver chloride electrodes were used, together with standard potentials determined in an earlier investigation. The pK increases in linear fashion with the salinity (S) of the medium, for values of S from 0 to 45‰. The solvent effect is given by 8.802+0.00378S at 25°C with a mean deviation of 0.001. The medium effect of seawater on ΔH° at 25°C is less than 200 cal-mol−1 and less than 0.2 cal-oK-mol−1 on ΔS°.
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Bates, R.G., Calais, J.G. Thermodynamics of the dissociation of Bis H+ in seawater from 5 to 40°C. J Solution Chem 10, 269–279 (1981). https://doi.org/10.1007/BF00645016
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DOI: https://doi.org/10.1007/BF00645016