IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Ethene with Heptane

Components:
   (1) Ethene, (Ethylene); C2H4; [74-85-1]  NIST Chemistry WebBook for detail
   (2) Heptane; C7H16; [142-82-5]  NIST Chemistry WebBook for detail

Original Measurements:
   McDaniel, A. S., J. Phys. Chem. 1911, 15, 587-610.

Variables:
   Temperature = 295.55 K to 312.15 K
   Pressure = 101.3 (1 atm) kPa

Prepared By:
   H.L. Clever

Experimental Remarks:

   EVALUATOR'S COMMENT: McDaniel's data should be used with caution. His values are often 20 percent or more too small when compared with more reliable data.

Experimental Data:   (Subscripts 1,2,3, ..., in column headings refer to components 1,2,3, ...)


t/°C	T/K	Ostwald coefficient L [cm³ cm^–3]	Ostwald Note	α	α Note	Mole Fraction (x₁)	x₁ Note
22.4	295.55	3.4640	b	3.2071	a, d	2.06	d
25.0	298.15	3.4061 c	b	3.1205	a, d	2.01	d
35.0	308.15	3.1860	b	2.8245	a, d	1.85	d
39.0	312.15	3.1100	b	2.7215	a, d	1.79	d

Notes:
   ^a  Bunsen coefficient, α/cm³ (STP) cm^–3 atm^–1.
   ^b  Listed as absorption coefficient in the original paper. Interpreted to be equivalent to Ostwald coefficient by compiler.
   ^c  Ostwald coefficient (absorption coefficient) estimated 298.15 K value by author.
   ^d  Mole fraction and Bunsen coefficient values calculated by compiler assuming ideal gas behavior.

Method/Apparatus/Procedure:
   The apparatus is all glass. It consists of a gas buret connected to a contacting vessel. The solvent is degassed by boiling under reduced pressure. Gas pressure or volume is adjusted using mercury displacement. Equilibration is achieved at atm pressure by hand shaking, and incrementally adding gas to the contacting chamber. Solubility measured by obtaining total uptake of gas by known volume of the solvent.

Source and Purity of Materials:
   (1) Ethene. Prepared by reaction of 1, 2-dibromoethane with zinc-copper.
   (2) Heptane. No details given.

Estimated Errors:
   Solubility: δ L/L ≥ –0.20