Apparent Molar Volume and Expansibilityof Cyclohexanol in Benzene and Cyclohexane Solutions

Abstract

The density of solutions of cyclohexanol in benzene and cyclohexane (up to 12.1 and 1.4 molÁkg À1 , respectively) was measured at 20, 25, 30, 40, 50, and 60 C. On the basis of the limiting partial molar volume and its temperature dependence, the apparent molar expansibility of cyclohexanol was estimated. The excess molar volume and the excess thermal expansion coef®cient of the solute in the studied solvents as well as in water were derived and are discussed on the basis of solute-solvent interactions. In addition, the limiting partial molar volume of the solute is interpreted in terms of the scaled particle theory. The solvent effect on the partial molar volume of the solute was found to be due mainly to cavity formation and intermolecular dispersion forces.

Volume-related properties of thiophene and furan-2-carboxaldehyde phenylhydrazone derivatives in DMSO: A discussion about non-intrinsic contribution

“…This difference can be discussed based on the basis of the differences between V T 2 and V gp . While V gp has geometrical information as the steric component, V T 2 contains additional factors related to the vibrational contribution from β T [18,41,37,42], and the structural component as consequence of the solvent reorganization represented by ∆H c[43]. For instance, in rigid systems -with low vibrational contribution -the repulsive component of non-intrinsic volume should be better represented by V gp , thereby, the θ Γ should be in agreement with the experimental value.…”

Partial molar volume of mefenamic acid in alcohol at temperatures between T=293.15 and T=313.15 K

“…In case of positive S v values (Table 8), the solvent molecules are believed to be more structured in the bulk phase than in the solvation sphere and an increase in the concentration of the drug compound results in the release of solvent molecules from the solvation shell into the bulk solvent that is more structured. 13 The characteristic of the co-sphere depends upon the drug structure, size, shape and solvophobicity. 14 Table 8 shows that the partial molar volume (V -), partial molar expansivity (E 0 2 ) and isobaric thermal expansion coefficient (α 2 ) are independent of concentration and that the values of V -for mefenamic acid increase with rise in temperature in all the solvents employed here.…”

“…partial molar volume (V -) and solute-solute interaction parameter (S v ), were considered to be sufficient to represent the data adequately. The values of partial molar expansivity were then calculated 13 from the partial molar volume by the relation:…”

Volumetric, ultrasonic speed, and viscometric studies of salbutamol sulphate in aqueous methanol solution at different temperatures

“…The evaluated values of V 0 / and S v are listed in table 3. The values of molar expansivity are calculated [15] from the partial molar volume using the relation (3) as follows:…”