IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Octadecane with Water

Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) Octadecane; C18H38; [593-45-3]  NIST Chemistry WebBook for detail

Evaluator:
   G.T. Hefter, School of Mathematical and Physical Sciences, Murdoch University, Perth, W.A., Australia. June 1986.

Critical Evaluation:

   Quantitative solubility data for octadecane (1) in water (2) have been reported in the publications listed in Table 1. No data have been reported on the solubility of water in octadecane.

The original data in all of these publications are compiled in the Data Sheets immediately following this Critical Evaluation.

With the exception of the graphical (ref 1) and v/v data (ref 3) reported by Baker which have been excluded from consideration, all the available data (ref 2,4) are summarized in Table 2 below. The reported values are in poor agreement and both are several orders of magnitude higher than would be predicted by an extrapolation of the lower n-alkane solubilities, viz. ~ 10^-10 g(1)/100 g s1n, although the validity of this extrapolation is unknown. Nevertheless it must be recognized that the reported values may be substantially in error and no “best” value has been suggested.

Experimental Data:   (Notes on the Nomenclature)

Table 1. Quantitative Solubility Studies of Octadecane (1) in Water (2)
Author	T/K	Reference	Method
Baker	298-353	1	radiotracer
Baker	289	2	radiotracer
Baker	298	3	not specified
Sutton and Calder	298	4	GLC

Table 2. Reported Values of the Solubility of Octadecane (1) In Water (2)
T/K	Reference	Sol. Power	Solubility	Sol. Note	x₁ Power	x₁	x₁ Note
298	2, 4	7	6, 2.1 g(1)/100g sln	a	10	4.2, 1.5	a

Notes:
Table 2^a  No "best" values suggested because of possible errors in data; see text.

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

   1  Baker, E.G., Am. Chem. Soc., Div. Petrol. Chem., Preprints-Symposia 1956, 1, No. 2, 5-17.
   2  Baker, E.G., Am. Chem. Soc., Div. Petrol. Chem., Preprints 1958, 3, No. 4, C61-8.
   3  Baker, E.G., Science 1959, 129, 871-4.
   4  Sutton, C.; Calder, J.A., Environ. Sci. Technol. 1974, 8, 654-7.