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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Ethanol with Octane (n-octane) and Water
Components:
(1) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
(2) Ethanol (ethyl alcohol); C2H6O; [64-17-5]
NIST Chemistry WebBook
for detail
(3) Octane (n-octane); C8H18; [111-65-9]
NIST Chemistry WebBook
for detail
Original Measurements:
Vorobeva, A.I.; Karapetyants, M., Kh., Zh. Fiz. Khim. 40, 3018 (1966).
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 w
1
Mass Fraction w
2
Mole Fraction x
1
(compiler)
Mole Fraction x
2
(compiler)
25
298.2
0.000
0.999
0.0000
0.9937
25
298.2
0.173
0.821
0.3330
0.6374
25
298.2
0.291
0.698
0.4845
0.4687
25
298.2
0.428
0.552
0.6099
0.3172
25
298.2
0.563
0.408
0.7023
0.2052
25
298.2
0.590
0.376
0.7121
0.1830
25
298.2
0.665
0.292
0.7449
0.1319
25
298.2
0.677
0.272
0.7382
0.1196
25
298.2
0.729
0.199
0.7339
0.0808
25
298.2
0.745
0.171
0.7242
0.0670
25
298.2
0.753
0.160
0.7240
0.0620
25
298.2
0.767
0.123
0.6986
0.0452
25
298.2
0.771
0.100
0.6756
0.0353
25
298.2
0.757
0.054
0.5998
0.0173
25
298.2
0.712
0.033
0.5169
0.0097
25
298.2
0.700
0.024
0.4945
0.0068
25
298.2
0.667
0.020
0.4521
0.0055
25
298.2
0.484
0.004
0.2697
0.0009
25
298.2
0.417
0.002
0.2191
0.0004
25
298.2
0.358
0.001
0.1792
0.0002
Compositions of coexisting phases
t/°C
T/K
Mass Fraction w
1
Mass Fraction w
2
Mole Fraction x
1
(compiler)
Mole Fraction x
2
(compiler)
Comment(s)
25
298.2
0.000
1.000
0.000
1.000
hydrocarbon-rich phase
25
298.2
0.028
0.972
0.0067
0.933
hydrocarbon-rich phase
25
298.2
0.046
0.953
0.106
0.888
hydrocarbon-rich phase
25
298.2
0.074
0.924
0.164
0.825
hydrocarbon-rich phase
25
298.2
0.184
0.811
0.351
0.624
hydrocarbon-rich phase
25
298.2
0.234
0.758
0.418
0.546
hydrocarbon-rich phase
25
298.2
0.298
0.691
0.493
0.461
hydrocarbon-rich phase
25
298.2
0.360
0.625
0.553
0.388
hydrocarbon-rich phase
25
298.2
0.684
0.020
0.472
0.006
water-rich phase
25
298.2
0.764
0.064
0.621
0.021
water-rich phase
25
298.2
0.770
0.105
0.680
0.037
water-rich phase
25
298.2
0.738
0.190
0.739
0.077
water-rich phase
25
298.2
0.588
0.380
0.714
0.186
water-rich phase
25
298.2
0.515
0.460
0.674
0.243
water-rich phase
25
298.2
0.442
0.538
0.622
0.306
water-rich phase
25
298.2
0.360
0.625
0.553
0.388
water-rich phase
Method/Apparatus/Procedure:
The titration method, Ref. 1, was used to determine solubility of the mixtures. The third component was added to the binary homogeneous mixture until cloudiness was first observed. Density of the saturated mixtures was measured; these results were graphed. To obtain equilibrium, ternary mixtures were stirred in a thermostat vessel for several hours. After phase separation, the density of each phase was measured and composition was determined from the graphs prepared earlier. Concentration at the critical point was found by method described in Ref. 2. Water included in ethanol was taken into account in all measurements.
Source and Purity of Materials:
(1) Source not specified, "rectificate grade," distilled; water concentration was determined by the Karl Fischer method.
(2) Source not specified; b.p.=125.5°C, n(20°C,D)=1.3976.
(3) Source not specified.
Estimated Errors:
Solubility: Not reported.
Temperature: Solubility ±0.001 mass fraction.
References:
1
W. D. Bancroft, Phys. Rev. 3, 21 (1896).
2
E. N. Zilberman, Zh. Fiz. Khim. 26, 1458 (1952).