IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: 2,2-Dimethylbutane with Water

Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) 2,2-Dimethylbutane; C6H14; [75-83-2]  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 2,2-dimthylbutane (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 2,2-DIMTHYLBUTANE (1) IN WATER (2)

The solubility data for 2,2-dimethylbutane in water are listed in Table 2. 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). The agreement between the other reported values at 298K (ref 1,2,3) is only fair (± 10% relative) and the average “best” value can only be regarded as tentative at this stage. It should also be noted that the increase in solubility as the temperature goes from 298 K to 273 K reported by Polak and Lu (ref 2) is larger than typically observed in hydrocarbon-water systems (e.g. benzene in water).

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

The solubility of water in 2,2-dimthylbutane has been reported in only one publication (ref 2), and thus no Critical Evaluation can be made. However, the data of Polak and Lu are generally in good agreement with “Recommended” values in well-characterized systems. The interested user is referred to the appropriate data sheet for solubility values.

Experimental Data:   (Notes on the Nomenclature)

Table 1. Quantitative Solubility Studies of the 2, 2-Dimethylbutane (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

Table 2. Tentative Values of the Solubility of 2, 2-Dimethylbutane (1) in Water (2)
T/K	Reference	Sol. Power	Solubility	Best Sol. Power	Best Solubility	Best Sol. Note	x₁ Power	x₁	x₁ Note
273	2	3	3.94 g(1)/100g sln	3	3.9 g(1)/100g sln	a	6	8.2	a
298	1, 2, 3	3	1.84, 2.38, 2.11 g(1)/100g sln	3	2.1 ± 0.2 g(1)/100g sln	a	6	4.4	a

Notes:
Table 2^a  Obtained by averaging where appropriate; 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.