Abstract
The conductances of aqueous solutions of tris(hydroxymethyl)aminomethane hydrochloride (Tris·HCl) at 25°C and 37°C have been measured. The concentration of salt varied from 4×10−4 to 1.6×10−2 mole-dm−3. The data were analyzed by the full Pitts equation which yielded the following parameters: at 25°C, Λ° = 106.07 S-cm2-mole−1, KA=1.01; at 37°C, Λ° = 106.07 S-cm2-mole−1, KA=0.99. These values suggest that Tris·HCl is essentially completely dissociated in water. The mobility of the Tris·H+ ion was found to be considerably smaller than that of the alkali metal cations. This result is consistent with abnormal liquid-junction potentials for Tris buffer solutions at 25 and 37°C.
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Klein, S.D., Bates, R.G. Conductance of tris(hydroxymethyl)-aminomethane hydrochloride (Tris·HCl) in water at 25 and 37°C. J Solution Chem 9, 289–292 (1980). https://doi.org/10.1007/BF00644554
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DOI: https://doi.org/10.1007/BF00644554