IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Indole with Benzene

Components:
   (1) Benzene; C6H6; [71-43-2]  NIST Chemistry WebBook for detail
   (2) Indole; C8H7N; [120-72-9]  NIST Chemistry WebBook for detail

Original Measurements:
   Yokoyama, C.; Ebina, T.; Takahashi, S., J. Chem. Eng. Data 1993, 38, 583-586.

Variables:
   Temperature = Temperature

Prepared By:
   W.E. Acree, Jr.

Experimental Data:   (Notes on the Nomenclature)


T/K	Mole Fraction x₁	Mole Fraction x₂	Comment(s)
278.73	0.0000	1.0000	Solid Phase (2)
275.05	0.0521	0.9479	Solid Phase (2)
268.31	0.2000	0.8000	Solid Phase (2)
266.37	0.2510	0.7490	Solid Phase (2)
269.32	0.2810	0.7190	Solid Phase (1)
274.58	0.3490	0.6510	Solid Phase (1)
279.40	0.4010	0.5990	Solid Phase (1)
288.54	0.5010	0.4990	Solid Phase (1)
303.68	0.7150	0.2850	Solid Phase (1)
309.88	0.7920	0.2080	Solid Phase (1)
317.59	0.9020	0.0980	Solid Phase (1)
326.26	1.0000	0.0000	Solid Phase (1)

Notes:
     Authors report eutectic point occurs at x₁ = 0.2552 and T/K = 265.90.

Method/Apparatus/Procedure:
   Constant temperature bath and a precision thermometer.
Mixtures of known concentrations sealed in glass ampoules and placed in constant temperature to equilibrate. Samples were rotated while bath temperature slowly increased. Solubility determined by visual noting the same temperature at which the last trace of solid solute disappeared.

Source and Purity of Materials:
   (1) 99.9%, Aldrich Chemical Company, Milwaukee, Wisconsin, USA, was used as received.
   (2) 99.9+ %, Wako Pure Chemical Ind Ltd., was dried over molecular sieves prior to use.

Estimated Errors:

   Temperature: T/K: precision ± 0.02. x₁: ± 0.0001.