Four experimental measurements of the solubility of fluorobenzene in water have been reported in the literature (1-4), see Figure 1. However, only one single measurement of the solubility of water in fluorobenzene has been reported (5). Some of the more recent data for the solubility of fluorobenzene in water is that of Nelson and Smit (4) in the temperature range between 278 and 318 K. However, despite equilibrium periods of 24 hours (which might not have been long enough), the measured solubilities are substantially lower than those found by earlier investigators. It is not possible to establish any shortcomings of the experimental procedures from the very brief description. No information was provided on the source and purity of materials used. Also, it was not indicated whether of not a water stripper had been employed for the analysis of the very dilute aqueous solutions by gas chromatogrophy, or whether of not an internal standard had been used for the calibration of the gas chrmotograph which employed a flame ionization detector. However, the authors agreed to re-examine their raw data in order to verify the reported values (6). Consequently, for the present evaluation, their results have not been considered for inclusion in the selected solubility values.
Jockers (3) reported the solubility of fluorobenzene in water at high temperatures and high pressure only. The objective of these measurements was to establish the phase equilibria and thermodynamics for fluid mistures in which fluorobenzene and water are miscible in all proportions. The critical curve was also determined (7, 8). There are no other solubility measurements in the temperature range between 546 and 562 K and in the pressure range between 96 x 105 and 114 x 105 Pa for comparison.
The two experimental determinations by Andrews and Keefer (1) at 298.15 K and Gross et al. (2) at 303.15 K are in good agreement with respect to the errors estimated by the authors. The recommended solubility has been established as the arithmetic mean of the two solubility and temperatures.
Only a single solubility measurement for the solubility of water in fluorobenzene has been reported in the literature (5). This experimental determination was done by Wing in 1956 (9) at Purdue University in partial fulfillment of the requirements for the Doctor of Philosophy degree. This measurement was made by an isotopic dilution technique using tritiated water as the tracer. There are no other reported values for comparison and selection.
Recommended solubility values are as follows (that for water in fluorobenzene is tentative):