Abstract
It is proposed that NH4OH be used as a standard for determining dissociation constants on a standard basis. Ultrasonic absorption and electrical conductance measurements as a function of pressure provide the basis for quantitative evaluation of all parameters except activity coefficients. It is shown how the weak ionization of NH4OH can be used to minimize uncertainty due to activity coefficients. Density data at atmospheric pressure confirm the\(\Delta \bar V^\circ\) values used to provide quantitative explanations of the acoustic and conductance data. Application of the differential sound absorption technique should extend the method dissociation constants of other classes of salts, in particular the 1–2, 2–2, and 3–2 sulfates.
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Fisher, F.H. Dissociation constants: NH4OH as a standard. J Solution Chem 8, 549–556 (1979). https://doi.org/10.1007/BF00655211
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DOI: https://doi.org/10.1007/BF00655211