Die Wasserstoffbrückenbildung als primärer Elementarvorgang bei der Ionisation schwacher Säuren und bei Säure-Basen-Katalysen in wäßriger Lösung

The mechanism of the ionisation of weak acids was elucidated according to the interpretation of the acid—base-catalysis of the mutarotation of α-glucose by the author. The primary elementary reaction of the ionisation of weak acids is the exothermic formation of the hydrogen bridge of the acid with the polar solvent. The secondary reaction is the endothermic total transfer of the proton to the solvent. The thermodynamic values of both elementary reactions were determined for the ionisation of different weak acids in aqueous solution and in this way a contribution was made to the thermodynamics of intermediate reactions which was propagated by the autorh. The formation of hydrogen bridge at the acid—base-catalysis of the mutarotation of α-glucose is discussed from the point of view of the mechanism of ionisation of weak acids. Furthermore the limits of the validity of theBrönsted equation for the acid—base-catalysis of the mutarotation of α-glucose were demonstrated.