we assume the equilibrium constant is given as in Hill17where Eel is the ionization potential of H which is found to be -13.595 eV.ls Substitution of the appropriate constant yields a value for KT = 1.852 X ~m -~. Conversion to mol/L gives log KT = -231.5123. AG is then computed from (A31AH for reaction A1 is taken as the ionization energy in kcal/mol and A S is computed fromResults are tabulated in Table V. ZrKz(P04)z, 34370-44-0; HC1, 7647-01-0. Registry No. ZrLiz(P04)z, 34370-43-9; ZrNa2(P0& 28132-50-5; (16) Alberti, G.The vapor pressures of complex species of the systems GdC13/A1C13 and TmC13/A1C13 were investigated by radiochemical analysis. The composition as well as the enthalpies and entropies of formation of the complexes were calculated.

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SummaryThe vapour pressure of CuC12 and the dimerization of CuC12(g) have been investigated by optical spectroscopy in the range 420-650 "C, pc12= 0.5-5 atm.The enthalpy of dimerization of CuC12(g) was determined by visible and by Raman spectroscopy and good agreement was found

Ein einfaches Calorimeter zur Bestimmung der Mischungsenthalpien von geschmolzenen Salzen bei höheren Temperaturen wurde konstruiert. Es wurden die Mischungsenthalpien innerhalb der Serie von Systemen MeClGdCl3 (Me Alkalimetall) und der Serie NaClLnCl3 (Ln Lanthanoidenelement) sowie der Systeme NaBrNdBr3 und NaJNdJ3 in Abhängigkeit von der Zusammensetzung bestimmt. Der Verlauf der λf gegen f Kurven wird gedeutet. dabei werden in den Systemen MeClGdCl3 (MeK, Rb und Cs) nur Komplexe der Zusammensetzung GdCl63− nachgewiesen. Die Bindungskräfte innerhalb der Spezies sind überwiegend ionogen. Die Tendenz zur Bildung solcher Komplexe wächst (a) mit wachsendem Radius des Alkaliions, (b) mit abnehmendem Radius des Lanthanoidenions und (c) mit abnehmendem Radius des Halogenidions.

SummaryThe equilibria (1) and (2) :CoClz (s)+InC13 (g) + CoInCls (g) (2)were investigated by optical spectroscopy and by vapour pressure measurements using the transpiration method: dH(1)= 11.0 * 0.3 kcal mol-1, dS(1)= 8.9 5 0.3 e.u. ~l H ( 2 ) =18.6 * 1.3 kcal mol-l, dS(2)= 14.6 1.4 e.u.Together with thermodynamic data from the literature the results obtained allow a complete description of all heterogeneous solid/gas as well as the homogeneous equilibria in the gas phase of the system CoClz/InCl3 in the temperature range 500-800"