IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Carbon dioxide with 1-Heptanesulfonic acid, sodium salt; (sodium 1-heptylsulfonate) and Water

   (1) 1-Heptanesulfonic acid, sodium salt; (sodium 1-heptylsulfonate); C7H15O3SNa; [22767-50-6]  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.

   Temperature = 298.15 K
   Concentration = m2/mol kg-1 = 0.0 - 1.2

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/°CT/KTemp NoteMolality m1 [mol/kg]m1 NoteMolality m2 [mol/kg]m2 Note
25298.15a3.32, 3.392*c0.0b
   *  Value from Wilhelm, E.; Battino, R.; Wilcock, R. J. Chem. Rev. 1977, 72, 219.
   a  Added by the compiler.
   b  m2 = molality of sodium 1-heptylsulfonate.
   c  m1 = solubility of carbon dioxide.

   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 1-heptylsulfonate. Lancaster Synthesis, Ltd., stated to be 99 %.
   (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.

   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.