Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

For the molar metachor, a quantity expressing the electrostatic contribution from free (nonassociated and noncomplexed) ions to the surface tension of aqueous solutions of electrolytes, its additivity was verified for completely dissociating chlorides of univalent and divalent metals at concentrations up to 5 mol dm^-3. Owing to this property, the degree of dissociation could be estimated for associating components of solutions containing also completely dissociated electrolytes. Measurements revealed that NaCl, LiCl, MgCl₂ and CaCl₂ in mixed solutions are completely dissociated whereas ZnCl₂, CdCl₂ and UO₂Cl₂ at molar ratios NaCl:MeCl = 2:1 and higher ( at c_Cl- = 5 mol dm^-3) are completely transformed into electroneutral and anionic chloro complexes, the latter forming ion pairs and triplets with Na⁺ ions.