IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: 2,4-Dimethylpentane with Water

Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) 2,4-Dimethylpentane; C7H16; [108-08-7]  NIST Chemistry WebBook for detail

Evaluator:
   M.C. Haulait-Pirson, Department of Chemistry, University of Leuven, Belgium.
G.T. Hefter, School of Mathematical and Physical Sciences, Murdoch University, Perth, W.A., Australia. November 1984.

Critical Evaluation:

   Quantitative solubility data for the system 2,4-dimethylpentane (1) and water (2) are 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 in two parts.

1. THE SOLUBILITY OF 2,4-DIMTHYLPENTANE (1) IN WATER (2)
Solubility data for 2,4-dimethylpentane in water (ref 2, 4) are listed in Table 2 with the following exceptions. The datum of Krzyzanowska and Szeliga (ref 5) has been excluded because it does not appear to be independent of that of Price (ref 4). The earlier datum of McAuliffe (ref 1) is presumably superceded by his later determination (ref 2) and has also been excluded.

The 298K datum of Polak and Lu (ref 3) is considerably higher (ca. 25% relative) than other reported values (ref 2, 4). Furthermore, the increase in solubility between 298 and 273 K, as for other hydrocarbons investigated by these authors, is unusually large. The data of Polak and Lu (ref 3) are therefore rejected.

2. THE SOLUBILITY OF WATER (2) IN 2,4-DIMETHYLPENTANE (1)
The solubility of water in 2,4-dimthylpentane has been reported only by Polak and Lu (ref 3) and thus no critical evaluation can be made. The interested user is referred to the relevant Data Sheet for solubility values. However, it can be noted that the data of Polak and Lu are generally close to “Recommended” values in well characterized systems.

Experimental Data:   (Notes on the Nomenclature)

Table 1. Quantitative Solubility Studies for the 2, 4-Dimethylpentane (1) - Water (2) System
Author	T/K	Reference	Solubility	Method
McAuliffe	298	1	(1) in (2)	GLC
McAuliffe	298	2	(1) in (2)	GLC
Polak and Lu	273, 298	3	mutual	GLC, Karl Fischer
Price	298	4	(1) in (2)	GLC
Krzyzanowska and Szeliga	298	5	(1) in (2)	GLC

Table 2. Recommended (R) Value of the Solubility of 2, 4-Dimethylpentane (1) in Water (2)
Reference	Sol. Power	Solubility	Best Sol. Power	Best Solubility	Best Sol. Note	x₁ Power	x₁	x₁ Note
2, 4	4	4.06, 4.4 g(1)/100g sln	4	4.2 ± 0.2 (R) g(1)/100g sln	a	7	7.6 (R)	a

Notes:
Table 2^a  "Best" values obtained by averagaing; σ_n has no statistical significance.

References: (Click a link to see its experimental data associated with the reference)

   1  McAuliffe, C., Nature (London) 1963, 200, 1092-3.
   2  McAuliffe, C., J. Phys. Chem. 1966, 70, 1267-75.
   3  Polak, J.; Lu, B.C.Y., Can. J. Chem. 1973, 51, 4018-23.
   4  Price, L.C., Am. Assoc. Petrol. Geol. Bull. 1976, 60, 213-44.
   5  Krzyzanowska, T.; Szeliga, J., Nafta (Katowice) 1978, 12, 413-7.