Abstract
The concept of Frank's hypothesis (that is the effect of large tetra alkyl ammonium ions on the solvent structure, especially water, in the ion-ion and ion-solvent interactions) was found to be not applicable when water was replaced by one of the organic solvents e.g. Dimethyl formamide (DMF), in the solvent mixture, that is, if the study involves ion-ion and ion- solvent interactions in 1,5-pentane diol - DMF solvent mixture containing large cations of tetraalkyl ammonium iodides. The densities of binary solvent mixtures and salt solutions have been measured at 298.15 K by magnetic float densitometer. The apparent molar volumes at infinite dilution, ФV 0 , determined by ФV -values in the solvent mixtures, have been utilized to estimate the partial molar volumes of transfer, ΔФV 0 (tr), for various tetraalkyl ammonium iodide salts from DMF to 1,5-Pentane diol.
Highlights
A lot of works [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17] has been done on the apparent and partial molar volumes of electrolytes and non electrolytes in aqueous, non aqueous and in binary solvent mixtures, eg
The work on apparent molar volumes of tetraalkyl ammonium halides in aqueous and non aqueous solvents done by several scientists in the past reveals that the slope Sv of φv vs √C curves of R4NX salts is found to be positive in solvents of low dielectric constants medium
He proposed his hypothesis on the enforcement of water structure which is stated as the structure of water is enforced around the R4N+ ions on account of the water hating influence of the long alkyl chains
Summary
A lot of works [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17] has been done on the apparent and partial molar volumes of electrolytes and non electrolytes in aqueous, non aqueous and in binary solvent mixtures, eg. The work on apparent molar volumes of tetraalkyl ammonium halides in aqueous and non aqueous solvents done by several scientists in the past reveals that the slope Sv of φv vs √C curves of R4NX salts is found to be positive in solvents of low dielectric constants medium. This slope is found negative for R4NX salts, involving the larger of R4N+ ions, in solvents of high dielectric constants. The addition of salt, does not contribute to the volume of the solution as the cations hide themselves inside the cavities of water molecule structure and negative Sv values are found
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