Acid dissociation constant and related thermodynamic quantities for triethanolammonium ion in water from 0 to 50 C

Abstract
Earlier studies of the dissociation constants of monoethanolammonium and diethanolammonium ions and the thermodynamic constants for the dissociation processes have been supplemented by a similar study of triethanolammonium ion from 0° to 50° C. The dissociation constant (Kbh ) is given by the formula - log K b h = 1341.16 / T + 4.6252 - 0.0045666 T where T is in degrees Kelvin. The order of acidic strengths of the ions is as follows: Triethanolammonium >diethanolammonium>monethanolammonium. Conversely, monoethanolamine is the strongest of the three bases. The thermodynamic constants for the dissociation of one mole of triethanolammonium ion in the standard state at 25° C are as follows: Heat content change (ΔH°) 33.450 joule mole-1; entropy change (ΔS°), -36.4 joule deg-1 mole-1; heat-capacity change ( Δ C p ° ) , 52 joule deg-1 mole-1.

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