Apparent Molar Volumes of Multiply Charged Electrolytes

Abstract

The apparent molar volumes of K4Mo(CN)8, K3Cr(C2O4)3, Ca2Fe(CN)6, LaFe(CN)6 and K4Zr(C2O4)4 were measured using a pycnometric and dilatometric methods at 25 and 3.39°C. At 25°C K4Mo(CN)8 follows accurately, K3Cr(C2O4)3 and LaFe(CN)6 follow approximately the Debye-Huckel limiting law at high dilution. K4Zr(C204)4 shows very large deviations, probably due to chemical equilibria. At 3.39°C all the salts show positive deviations from the Debye-Huckel limiting law even at the lowest concentrations and have Vo values considerably smaller than at 25°C. This is considered as evidence that solute-solvent interactions are important in determining both Po and the change of <f>v with the concentration.