IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Carbon dioxide with Sulfuric acid monododecyl ester sodium salt; (sodium dodecyl sulfate) and Water

Components:
   (1) Sulfuric acid monododecyl ester sodium salt; (sodium dodecyl sulfate); C12H25O4SNa; [151-21-3]  NIST Chemistry WebBook for detail
   (2) Carbon dioxide; CO2; [124-38-9]  NIST Chemistry WebBook for detail
   (3) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Ownby, D. W.; Prapaitrakul, W.; King, A.D. Jr., J. Colloid Interface Sci. 1988, 125, 526-33.

Variables:
   Temperature = 298.15 K
   Concentration = m₂/mol kg^-1 = 0.0 - 0.6

Prepared By:
   H.L. Clever

Experimental Remarks:

   The measurements are made at several pressures up to 10 - 15 atm (1-1.5 MPa). The solubility values have been corrected to 1 atm (0.103 MPa) partial pressure of CO₂. See method below.

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


t/°C	T/K	Temp Note	Molality m₁ [mol/kg]	m₁ Note	Molality m₂ [mol/kg]	m₂ Note
25	298.15	a	3.32, 3.392*	c	0.0	b
25	298.15	a	3.54	c	0.2	b
25	298.15	a	3.69	c	0.4	b
25	298.15	a	3.91	c	0.6	b

Notes:
   ^*  Value from Wilhelm, E.; Battino, R.; Wilcock, R. J. Chem. Rev. 1977, 72, 219.
   ^a  Added by the compiler.
   ^b  m₂ = molality of sodium dodecyl sulfate.
   ^c  m₁ = solubility of carbon dioxide.

Method/Apparatus/Procedure:
   The apparatus and method are described in earlier papers (1, 2). Solubility is determined in a thermostated, magnetic stirred cylindrical brass bomb with an observation window. The solution is prepared and put in a glass liner in the bomb. The system is sealed, evacuated to a pressure just above water vapor pressure, and outgassed with stirring for several hours. The gas is added to a known pressure and equilibrated with stirring for a minimum of five hours. Stirring is stopped, the solution is allowed to become still. The gas is vented leaving the supersaturated solution under a gaseous pressure of atmospheric pressure for a fixed time of 30 to 60 seconds. The rate of gas loss during the still condition is measured to use in a later correction. The gas is stirred and collected. The total volume of gas is measured along with ambient pressure and temperature.

Source and Purity of Materials:
   (1) Carbon dioxide. Matheson Gas Products. Commercial grade, stated to be 99.5 % min purity.
   (2) Sodium dodecyl sulfate. BDH Prod. No. 44244, Lot No. 908811C, stated to be 99.0 %.
   (3) Water. Nothing specified, but have used doubly distilled water in earlier work.

Estimated Errors:
   Solubility: δm₁/mol kg^-1 = 0.02 x 10^-2
   Temperature: δT/K not specified.

References:
   1. Matheson, I.B.C.; King, A.D. Jr., J. Colloid Interface Sci. 1978, 66, 464.
   2. Bolden, P.L.; Hokins, J.C.; King, A.D. Jr., J. Colloid Interface Sci. 1983, 91, 454.