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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Pyrene with n-Hexane and 2-Propanol
Components:
(1) 2-Propanol; C3H8O; [67-63-0]
NIST Chemistry WebBook
for detail
(2) n-Hexane; C6H14; [110-54-3]
NIST Chemistry WebBook
for detail
(3) Pyrene; C16H10; [129-00-0]
NIST Chemistry WebBook
for detail
Original Measurements:
Zvaignze, A.I.; Acree, W.E., Jr., J. Chem. Eng. Data 1993, 38, 393-395.
Variables:
Temperature = 299 K
Prepared By:
W.E. Acree, Jr. and A.I. Zvaigzne
Experimental Data:
(Notes on the Nomenclature)
t/°C
Mole Fraction x
1
Mole Fraction x
3
x
3
s
26.0
0.00857
0.0000
0.0000
26.0
0.00867
0.1661
0.1676
26.0
0.00825
0.2942
0.2966
26.0
0.00700
0.5214
0.5251
26.0
0.00619
0.6264
0.6303
26.0
0.00547
0.7160
0.7199
26.0
0.00412
0.8615
0.8651
26.0
0.00352
0.9268
0.9301
26.0
0.00290
0.9971
1.0000
Notes:
x
3
(s)
: initial mole fraction of binary solvent mixture; x
1
: mole fraction solubility of the solute; x
3
: mole fraction of component 3 in the ternary solution.
Method/Apparatus/Procedure:
Constant temperature bath, calorimetric thermometer, and an ultraviolet/visible spectrophotometer.
Binary solvent mixtures were prepared by weight. Excess solute and solvent placed in amber glass bottles and allowed to equilibrate for several days at constant temperature. Attainment of equilibrium was verified by several repetitive measurements and by approaching equilibrium from supersaturation. Aliquots of saturated solutions transferred through a coarse filter into tared volumetric flasks, weighed and diluted with methanol. Concentrations determined spectrophotometrically at 372 nm.
Source and Purity of Materials:
(1) 99 %, Aldrich Chemical Company, Milwaukee, Wisconsin, USA, recrystallized 3 times from absolute ethanol.
(2) 99.9+ %, Aldrich Chemical Company.
(3) 99+ %, anhydrous, Aldrich Chemical Company. Components 2 and 3 were stored over molecular sieves and distilled shortly before use.
Estimated Errors:
Temperature: T/K: ± 0.05. x
3
(s)
: ± 0.0001. x
1
: 1.5 % (relative error).