[en] Calorimetry was used to measure mixing heats of MEdta^2- solutions ( M - Zn, Ni, Cu, Cd; ( Edta^4- - ethylenediaminetetraacetate-ion ) with solutions of potassium iminodiacetate (Imda^2-) and nitrilotriacetate ( Nta^3- ) at 298.15 K and I = 1.5 ( KNO₃ ). It was established that mixed-ligand complexes of MEdtaImda^4- composition formed in result of interaction of NiEdta^2- and CdEdta^2- solutions with iminodiacetate. Interaction in MEdta^2- - Nta³ system was not revealed. Thermodynamic characteristics of MEdta^2- + Imda^2- = MEdtaImda^4- ( M - Ni, Cd) reactions were calculated

[en] To find the thermal effects of formation of complex compounds of hafnium with the fluoride ion the thermal effects are measured calorimetrically of dissolution of crystalline HfCl₄ in aqueous solutions of hydrofluoric acid at 25 deg C. On the basis of the data obtained the changes in enthalpy and entropy during the formation of the complexes HfF₆^2-, HfF₅^-, and HfF₄ in a standard aqueous solution are calculated

[en] Heat effects of ZrCl₄ dissolution in aqueous solutions of hydrofluoric acid of various concentrations have been measured calorimetrically at 25 deg C. Enthalpy and entropy changes during the formation of the following complexes have been measured: ZrF₆^2-, ZrF₅^-, ZrF₄ and ZrF₃⁺. The obtained results are discussed

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[en] Equilibria in M²⁺ - Nta^3- - En (M=Ni, Cu, Zn, Cd; Nta^3- - anion of nitrilotriacetic acid; En - ethylene diamine) system are studied at 298.15 K and ionic strength I=0.5 (NaNO₃). Equilibria constants of formation reactions of heteroligand complexes of MNtaEn^- composition are determined

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[en] Reactions of Cu², Ni², Zn², Cd² ethylenediaminetetraacetates with the glycine solution at 298.15 K and ionic strength 1.5(KNO₃) are investigated by the calorimetric method. Equilibrium constants and other thermodynamic characteristics of reactions of MEdta^2-+Gl^- → MEdtaG^3- type are calculated