IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: 3-Methylhexane with Water

Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) 3-Methylhexane; C7H16; [589-34-4]  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 3-methylhexane (1) and water (2) have been reported in the publications listed in Table 1.

The original data in 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 3-METHYLHEXANE (1) IN WATER (2)
Although the solubility of 3-methylhexane in water has been reported in three publications (ref 1, 2, 3) the datum of Krzyzanowska and Szeliga (ref 3) does not appear to be independent of that of Price (ref 2) and is thus excluded from consideration. The remaining 298 K data, of Price (ref 2) and Polak and Lu (ref 1), are in poor agreement. In the absence of confirmatory studies the average of these two studies: (3.8 ± 0.9) x 10^-4g(1)/100g s1n, x₁ = 6.8 x 10^-7, is regarded as the “Tentative” solubility of 3-methylhexane in water. However, it may be noted that Polak and Lu’s values for other hydrocarbon water systems are often higher and Price’s values often lower than “Recommended” values.

2. THE SOLUBILITY OF WATER (2) IN 3-METHYLHEXANE (1)
The solubility of water in 3-methylhexane has been reported only by Polak and Lu (ref 1) and so 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 of the System 3-Methylhexane (1) - Water (2)
Author	T/K	Reference	Solubility	Sol. Note	Method
Polak and Lu	273, 298	1	mutual	-	GLC, Karl Fischer
Price	298	2	(1) in (2)	-	GLC
Krzyzanowska and Szeliga	298	3	(1) in (2)	-	GLC

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

   1  Polak, J.; Lu, B.C.Y., Can. J. Chem. 1973, 51, 4018-23.
   2  Price, L.C., Am. Assoc. Petrol. Geol. Bull. 1976, 60, 213-44.
   3  Krzyzanowska, T.; Szeliga, J., Nafta (Katowice) 1978, 12, 413-7.