Apparent molar volumes and compressibilities of alkaline earth metal ions in methanol and dimethylsulfoxide

Apparent molar volumes and compressibilities of selected electrolytes in dimethylsulfoxide

“…The results suggest that the anions are better solvated than the cation in dimethylsulfoxide. This is in obvious contradiction with the results of other studies [24].…”

Solvation of multivalent cations in methanol – Apparent molar volumes, expansibilities, and isentropic compressibilities

“…The fact that it is sometimes regarded as water analog makes, in our opinion, this selection all the more justified. Our previous works have dealt with solvation of univalent [5] and divalent cations [6][7][8]. In the present paper we wish to supplement those studies with new data obtained for trivalent cations and on that basis comment our earlier findings.…”

“…The ionic values for CF 3 SO À 3 [5,8] were evaluated on the basis of the reference electrolyte method which assumes the equality of the standard partial molar quantities of the large, spherical, and low charge density cations and anions. The tetraphenylphosphonium tetraphenylborate (Ph 4 PBPh 4 ) has been used here as a reference electrolyte.…”

“…Due to irregular variation of the V 0 / as a function of temperature (see figure 1) the fitting procedure was applied only for V 0 / values at temperatures ranging from (283.15 to 298.15) K. The parameters of equation (6) are shown in table 6. Figure 2 presents the volumes of unsolvated ions V int [19] and calculated values of V 0 / , K 0 S;/ , and @V 0 / =@T for the trivalent cations along with the literature data for the divalent cations [7,8] (the values for Be 2+ and Cu 2+ were recalculated using X 0 / values for CF 3 SO À 3 ion from present study). In general, the partial molar quantities vary in accordance with charge densities of ions.…”

“…The sound analyzer OPTIME 1.0 from OPTEL (Poland) was used to obtain the sound velocities by the measuring the time necessary for pulse of ultrasound to travel known distance between a From reference [8] recalculated from densities in the way presented in reference [5].…”