Quantitative solubility data for the system 2,3-dimethylbutane (1) and water (2) have been reported in the publications listed in Table 1.

The original data in all of these publications are compiled in the Data Sheets immediately following this critical Evaluation. For convenience, further discussion of this system will be divided into two parts.



1. THE SOLUBILITY OF 2,3-DIMETHYLBUTANE (1) IN WATER (2)

The solubility data for 2,3-dimethylbutane in water (ref 2,3) are listed in Table 2 and plotted in Figure 1 The datum of Krzyzanowska and Szeliga (ref 4) has been excluded from this Evaluation as it does not appear to be independent of that of Price (ref 3).

At 298 K where comparison is possible, agreement between the reported values is only fair. At other temperatures only the values of Price (ref 3) are available. Thus all values are classified as Tentative. It should be noted firstly that the increase in solubility at lower temperatures reported by Polak and Lu (ref 2) is larger than is usually observed in hydrocarbon -water systems (e.g. benzene in water), and secondly the values of Price (ref 3) are usually reliable over the entire temperature range studied.



2. THE SOLUBILITY OF WATER (2) IN 2,3-DIMETHYLBUTANE (1)

The reported solubility data for water in 2,3-dimethylbutane (ref 1,2) are listed in Table 3. There are insufficient data to warrant plotting.

Agreement between the values at 273 K is excellent but at 298 K the datum of Englin et al. (ref 1) is about 50% (relative) higher than that of Polak and Lu (ref 2). In well characterized systems (e.g. water in benzene) the data of Englin et al. are generally satisfactory at T < 300 K but are markedly higher than "Recommended" values at higher temperatures. The value of Polak and Lu (ref 2) is therefore preferred at 298 K and at higher temperatures the data of Englin et al. should be regarded only as order of magnitude values.