IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: 3-Methylpentane with Water

Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) 3-Methylpentane; C6H14; [96-14-0]  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-methylpentane (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 3-METHYLPENTANE (1) IN WATER (2)

Of the data reported for the solubility of 3-methylpentane in water (Table 1), the datum of Krzyzanowska and Szeliga (ref 4) has been excluded from consideration because it does not appear to have been obtained independently of that of Price (ref 3). The 298 K datum of Polak and Lu (ref 2) is much higher (ca. 30% relative) than all other reported values (ref 1, 3, 5). Furthermore, the value at 273 K, as with other hydrocarbons investigated by these authors, shows an unusually large increase over the value at 298 K. Thus the data of Polak and Lu (ref 2) are rejected. All the remaining data (all at 298 K) are listed in Table 2).

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

The solubility of water in 3-methylpentane has been reported only by Polak and Lu (ref 2) 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 of the 3-Methylpentane (1) - Water (2) System
Author	T/K	Reference	Solubility	Method
McAuliffe	298	1	(1) in (2)	GLC
Polak and Lu	273, 298	2	mutual	GLC, Karl Fischer
Price	298	3	(1) in (2)	GLC
Krzyzanowska and Szeliga	298	4	(1) in (2)	GLC
Rudakov and Lutsyk	298	5	(1) in (2)	partition coefficient

Table 2. Recommended (R) Value for the Solubility of 3-Methylepentane 91) in Water (2)
T/K	Reference	Sol. Power	Solubility	Best Sol. Power	Best Solubility	Best Sol. Note	x₁ Power	x₁	x₁ Note
298	1, 3, 5	3	1.28, 1.31, 1.29 g(1)/100g sln	3	1.29 ± 0.01 (R) g(1)/100g sln	a	5	2.70 (R)	a

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

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

   1  McAuliffe, C., J. Phys. Chem. 1966, 70, 1267-75.
   2  Polak, J.; Lu, B.C.Y., Can. J. Chem. 1973, 51, 4018-23.
   3  Price, L.C., Am. Assoc. Petrol. Geol. Bull. 1976, 60, 213-44.
   4  Krzyzanowska, T.; Szeliga, J., Nafta (Katowice) 1978, 12, 413-7.
   5  Rudakov, E.S.; Lutsyk, A.I., Zh. Fiz. Khim. 1979, 53, 1298-1300.