Evaluator
Ari L. Horvath Imperial Chemical Industries (ICI) LimitedEvaluation
The reported experimental errors ±5.6% (1) and ±10% (2) are probably greater than the authors anticipated. A creful study of the experimental procedures described in both articles reveals no obvious shortcomings. Despite the long time allowed for equilibrium by Hine et al., their measurements resulted in a lower solubility value than that obtained by Yalkowsky et al. The most likely explanation for the discrepancy could be attributed to the analytical determinations used.
It is well known that the solubility curve for halogenated benzenes in water has a positive slope above room temperature. However, the two measured points reported are against this trend, that is, the values decrease with rising temperature. In order to choose between the two solubility data values, use was made of the theoretical relationship between the molar solubilities and the molar volumes of the solutes at 298.15 K as described in the Introduction. The following solubility value for 1,3-dibromobenzene in water is tentative:
None
| C $T$ ($\pu{K}$) | D $x_{1}$ | D MR1 (g/kg) | D $C_{1}$ (mol/dm3) |
|---|---|---|---|
| 298.15 | 4.89 x 10-6 | 6.40 x 10-2 | 2.70 x 10-4 |
Sources:
1
Hine, J.; Haworth, H. W.; Ramsay, O. B.; J. Am. Chem. Soc. 1963, 85(10), 1473-6.
2
Yalkowsky, S. H.; Orr, R. J.; Valvani, S. C.; Ind. Eng. Chem. Fundam. 1979, 18(4), 351-3.