IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Acetonitrile with cis-9-Octadecenoic acid (oleic acid)

Components:
   (1) cis-9-Octadecenoic acid (oleic acid); C18H34O2; [112-80-1]  NIST Chemistry WebBook for detail
   (2) Acetonitrile; C2H3N; [75-05-8]  NIST Chemistry WebBook for detail

Original Measurements:
   Hoerr, C.W.; Harwood, H.J., J. Phys. Chem. 56, 1068-73 (1952).

Variables:
   Temperature = 233 K to 303 K

Prepared By:
   Valerii P. Sazonov

Experimental Remarks:

   UCST reported as 61.0 °C (334.2 K, compiler).

Experimental Data:   (Notes on the Nomenclature)

Solubility of cis-9-octadecenoic acid (2) in acetonitrile (1)
t/°C	T/K	g₂/100 g solution	10² * Mass Fraction w₂ (compiler)	Mole Fraction x₂ (compiler)
-40.0	233.2	0.1	0.1	0.0001
-30.0	243.2	0.3	0.3	0.0004
-20.0	253.2	0.7	0.7	0.0010
-10.0	263.2	1.1	1.1	0.0016
0.0	273.2	1.8	1.8	0.0026
20.0	293.2	7.7	7.2	0.011
30.0	303.2	9.1	8.3	0.013

Method/Apparatus/Procedure:
   The synthetic method was used. Solubilities were determined by weighing 2 - 5 g portions of (2) into 2 cm × 15 cm Pyrex test-tubes which were fitted with a Nichrome stirrer and a thermocouple well, the test-tube being inserted into a larger tube which served as an air-bath. Upon successive additions of weighed amounts of (1), the solubilities were determined by measuring the temperatures at which crystals precipitated and dissolved upon alternately cooling and heating the systems in an acetone-dry ice-bath or water-bath as required.

Source and Purity of Materials:
   (1) Source not specified; best grade reagent; distilled.
   (2) Prepared from high quality oil by saponification; purified by recrystallization and by vacuum distillation in packed column; melting point = 16.30 °C, n(20 °C, D) = 1.4599.

Estimated Errors:

   Temperature: ± 0.1 K.