Components:

(1) Carbazole, C₁₂H₉N; [86-74-8] NIST WebBook
(2) Heptane, C₇H₁₆; [142-82-5] NIST WebBook

Original Measurements

Fung, H. L.; Higuchi, T.; J. Pharm. Sci. 1987, 60, 1782-1788.

Variables:

Ambient temperature: 298 K

Prepared by:

W.E. Acree, Jr.

Method/Apparatus/Procedure:

Constant temperature bath, calorimetric thermometer, and an ultraviolet/visible spectrophotometer. Excess solute and solvent placed in amber glass bottles and allowed to equilibrate for 24 hours at constant temperature. Attainment of equilibrium verified by repetitive measurements. Aliquots of saturated solutions transferred through a course filter into tared volumetric flasks, weighed and diluted with ether. Concentrations determined spectrophotometrically at 292.5 nm.

Source and Purity of Materials:

1. Reagent Grade, source not specified recrystallized from aqueous-ethanol to give a melting point of 242-243°C.
2. Reagent Grade, source not specified, was passed through a silica gel column and distilled over sodium.

Estimated Errors:

Ambient temperature: T/K: ±0.1 (compiler).
Mole fraction - Liquid (1): x₁: ±3% (relative error, compiler).