Components:
(1) Pyrene,
C16H10; [129-00-0]
NIST WebBook
(2) Heptane,
C7H16; [142-82-5]
NIST WebBook
(3) 1-Propanol,
C3H8O; [71-23-8]
NIST WebBook
Original Measurements
Zvaignze, A. I.; Acree Jr., W. E.; J. Chem. Eng. Data 1993, 38, 393-395.
Variables:
Ambient temperature: 299 K
Prepared by:
W.E. Acree, Jr., A.I. Zvaigzne
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:
- 99%, Aldrich Chemical Company, Milwaukee, Wisconsin, USA, recrystallized 3 times from absolute ethanol.
- HPLC Grade, 99.7+%, Aldrich Chemical Company.
- 99+%, anhydrous, Aldrich Chemical Company. Components 2 and 3 were stored over molecular sieves and distilled shortly before use.
Estimated Errors:
Ambient temperature: T/K: ±0.05. x3(s): ±0.0001. x1: 1.5% (relative error).
Experimental Values:
| T (°C) | xinit3 | x1 | x3 |
|---|---|---|---|
| 26.0 | 0.0 | 1.102 x 10-2 | 0.0 |
| 26.0 | 1.927 x 10-1 | 1.154 x 10-2 | 1.905 x 10-1 |
| 26.0 | 3.280 x 10-1 | 1.089 x 10-2 | 3.244 x 10-1 |
| 26.0 | 5.599 x 10-1 | 9.16 x 10-3 | 5.548 x 10-1 |
| 26.0 | 6.656 x 10-1 | 8.14 x 10-3 | 6.602 x 10-1 |
| 26.0 | 7.383 x 10-1 | 7.34 x 10-3 | 7.329 x 10-1 |
| 26.0 | 8.810 x 10-1 | 5.68 x 10-3 | 8.760 x 10-1 |
| 26.0 | 9.416 x 10-1 | 4.95 x 10-3 | 9.369 x 10-1 |
| 26.0 | 1.0 | 4.26 x 10-3 | 9.957 x 10-1 |
(None) x3(s): initial mole fraction of binary solvent mixture; x1: mole fraction solubility of the solute; x3: mole fraction of component 3 in the ternary solution.
