The ratios of the solubility in water to that in the mixed solvents
calculated by Eq. (3) with parameters of Table 2 are shown in Fig. 5.
While R = 20 or R = 40, the ratio almost keeps constant along with temperature.
Enthalpy and entropy of dissolution were studied.
The van’t Hoff equation relates the logarithm of mole fraction of a solute in an
ideal solution as a linear function of the reciprocal of the absolute
temperature as follows [9,10]