Komplexone, XLVII Die Thermodynamik der Komplexbildung von einigen ein- und zweiwertigen Metallionen mit Aethylendiamintetraacetat- und Uramildiacetat-Ion / Complexone, XLVII Thermodynamics of Complex Formation of Some Univalent and Bivalent Metal Ions with Ethylenediaminetetraacetate and Uramildiacetate Anions

Abstract

The enthalpies of complex formation of EDTA and uramildiacetate (UDA) with univalent cations (H+, Li+, Na+, K+, Ag+ and Tl+) have been obtained by direct calorimetric measurements at ionic strength 0.1 (or 1) and 20°C. For comparison data for the formation of 1:1 UDA complexes with Mg2+, Ca2+, Ba2+ and Sr2+ have also been obtained. From these values and the stability constants the thermodynamic functions ΔG and ΔS are calculated. The results are compared with those of similar systems.