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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Acetonitrile with Water
Components:
(1) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
(2) Acetonitrile; C2H3N; [75-05-8]
NIST Chemistry WebBook
for detail
Original Measurements:
Benter, G.; Schneider, H., Ber. Bunsen-Ges. Phys. Chem. 77, 997 (1973).
Variables:
Temperature = 264 K to 272 K
Prepared By:
Valerii P. Sazonov
Experimental Remarks:
The mutual solubility of acetonitrile (1) and water (2) in mole fractions was reported over the temperature range in graphical form. The data presented here were extracted from the published graphs by the compiler.
Experimental Data:
(Notes on the Nomenclature)
Mutual solubility of acetonitrile (1) and water (2)
t/°C
T/K
10
2
* Mass Fraction w
1
(compiler)
Mole Fraction x
1
Comment(s)
-8.80
264.35
32.4
0.174
Water-rich phase
-7.50
265.65
33.6
0.182
Water-rich phase
-5.90
267.25
36.3
0.200
Water-rich phase
5.80
267.35
-
-
Water-rich phase
-4.70
268.45
38.6
0.216
Water-rich phase
-4.20
268.95
-
-
Water-rich phase
-3.80
269.35
40.1
0.227
Water-rich phase
-3.30
269.85
41.6
0.238
Water-rich phase
-2.90
270.25
42.9
0.248
Water-rich phase
-2.50
270.65
-
-
Water-rich phase
-2.30
270.85
45.3
0.267
Water-rich phase
-1.80
271.35
48.2
0.290
Water-rich phase
-1.50
271.65
-
-
Water-rich phase
-1.40
271.75
52.5
0.327
Water-rich phase
-1.35
271.80
56.2
0.360
Water-rich phase
-8.80
264.35
-
-
Acetonitrile-rich phase
-7.50
265.65
78.4
0.615
Acetonitrile-rich phase
-5.90
267.25
-
-
Acetonitrile-rich phase
5.80
267.35
76.2
0.584
Acetonitrile-rich phase
-4.70
268.45
-
-
Acetonitrile-rich phase
-4.20
268.95
73.3
0.547
Acetonitrile-rich phase
-3.80
269.35
-
-
Acetonitrile-rich phase
-3.30
269.85
-
-
Acetonitrile-rich phase
-2.90
270.25
-
-
Acetonitrile-rich phase
-2.50
270.65
68.5
0.488
Acetonitrile-rich phase
-2.30
270.85
-
-
Acetonitrile-rich phase
-1.80
271.35
63.7
0.435
Acetonitrile-rich phase
-1.50
271.65
61.3
0.410
Acetonitrile-rich phase
-1.40
271.75
58.2
0.379
Acetonitrile-rich phase
-1.35
271.80
56.2 (UCST)
0.360
Acetonitrile-rich phase
Method/Apparatus/Procedure:
The turbidimetric titration method was used. A weighed amount of solution was placed in the mixing chamber described in work
1
and the temperature was varied until the opalescence showed that a phase separation occurred.
Source and Purity of Materials:
(1) Merck; synthetic grade; dried using molecular sieves and twice distilled in a fractionating column under a nitrogen atmosphere; concentration of impurities to be less than 0.003 mole % by GLC.
(2) De-ionized; twice distilled in a quartz apparatus.
Estimated Errors:
Temperature: ± 0.05 K
References:
1. M. Moolel and H. Schneider, Zh. Phys. Chem. (Munich) 74, 237 (1971).