IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Methanol with Toluene and Water

Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) Methanol (methyl alcohol); CH4O; [67-56-1]  NIST Chemistry WebBook for detail
   (3) Toluene (methylbenzene); C7H8; [108-88-3]  NIST Chemistry WebBook for detail

Original Measurements:
   Mason, L.S.; Washburn, E.R., J. Am. Chem. Soc. 59, 2076 (1937).

Variables:
   Temperature = 298 K

Prepared By:
   A. Skrzecz

Experimental Data:   (Notes on the Nomenclature)

Compositions along the saturation curve
t/°C	T/K	Mass Fraction w₁	Mass Fraction w₂	Mole Fraction x₁ (compiler)	Mole Fraction x₂ (compiler)
25	298.2	0.0832	0.9128	0.2040	0.7785
25	298.2	0.1302	0.8624	0.2937	0.6766
25	298.2	0.2622	0.7240	0.4869	0.4675
25	298.2	0.3684	0.6037	0.5867	0.3343
25	298.2	0.5056	0.4394	0.6686	0.2021
25	298.2	0.6215	0.2699	0.6841	0.1033
25	298.2	0.6735	0.1472	0.6454	0.0491
25	298.2	0.6573	0.0720	0.5648	0.0215
25	298.2	0.5940	0.0283	0.4657	0.0077
25	298.2	0.5312	0.0137	0.3948	0.0035
25	298.2	0.4106	0.0050	0.2828	0.0012
25	298.2	0.2400	0.0014	0.1510	0.0003
25	298.2	0.0672	0.0006	0.0389	0.0001

Distribution of methanol in methanol-toluene-water system
t/°C	T/K	Mass Fraction w₁	Comment(s)
25	298.2	0.000	hydrocarbon-rich phase
25	298.2	0.001	hydrocarbon-rich phase
25	298.2	0.002	hydrocarbon-rich phase
25	298.2	0.002	hydrocarbon-rich phase
25	298.2	0.004	hydrocarbon-rich phase
25	298.2	0.008	hydrocarbon-rich phase
25	298.2	0.022	hydrocarbon-rich phase
25	298.2	0.025	water-rich phase
25	298.2	0.101	water-rich phase
25	298.2	0.154	water-rich phase
25	298.2	0.220	water-rich phase
25	298.2	0.322	water-rich phase
25	298.2	0.406	water-rich phase
25	298.2	0.428	water-rich phase

Method/Apparatus/Procedure:
   The titration method was used. Water was added to binary alcohol-toluene mixtures of known composition until the saturation point was reached. The refractive indexes of these mixtures were determined with an immersion refractometer and then were used to construct the refractive index/compositions of equilibrium phases.

Source and Purity of Materials:
   (1) Synthetically prepared; dried over lime, distilled; d(25°C,4°C)=0.78672, n(25°C,D)=1.326 60
   (2) Mallinckrodt, reagent grade; dried over Na, distilled; d(25°C,4°C)=0.86216, n (25°C,D)=1.493 75.
   (3) Distilled form KMnO₄.

Estimated Errors:
   Solubility: Not reported.
   Temperature: Not reported.