IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Carbon dioxide with Aerosol OT and Water
Components:
   (1) Aerosol OT; C20H38O7S.Na; [577-11-7]  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:
   Gjaldbæk, J. Chr. Acta Chem. Scand. 1953, 7, 537-44.

 Variables:
   Temperature = 298.15 K
   Pressure = 298.15 K
   Concentration = 102w2 = 0 - 0.15

 Prepared By:
   J. Chr. Gjaldbæk

 Experimental Data:   (Subscripts 1,2,3, ..., in column headings refer to components 1,2,3, ...)
   
T/KPressureMass Fraction (w2)w2 Noteα [cm3(STP)/cm3atm]α NoteMole Fraction (x1)x1 Note
298.15(760) 0.00 (a)0.754 (c)6.12 (b)
298.15793.4 0.15 (a)0.751 (c)6.10 (b)
298.15725.20.15(a)0.750 (c)6.09 (b)
 Notes:
   a  w2 =mass fraction of Aerosol OT

Aerosol OT = Dioctylester of the sodium salt of sulfotartaric acid. pH = 7.4.
   b  The mole fraction solubility values were adjusted to a gas partial pressure of 101.325 kPa (1 atm) by the compiler assuming Henry's law is obeyed.
   c  α = Bunsen coefficient

Method/Apparatus/Procedure:
   A calibrated all-glass combined manometer and bulb was enclosed in an air thermostat and shaken until equilibrium. Mercury was used for calibration and as confining liquid. The solvent was degassed in the apparatus.
The absorbed volume of gas is calculated from the initial and final amounts, both saturated with solvent vapor. The amount of solvent is determined by the weight of displaced mercury.
The mole fraction solubility values are at 1 atm assuming Henry's law is obeyed.
Details of the apparatus and procedure are given in Ref. 1 and 2.

 Source and Purity of Materials:
   (1) Prepared from potassium bicarbonate (analytical reagent) and concentrated sulfuric acid. 99.9 % CO2.
   (2) 100%. American Cyanamide Co.
   (3) Redistilled.

 Estimated Errors:
   Solubility: δx1/x1 = ± 0.015
   Temperature: δT/K = ± 0.05

 References:
   1. Lannung, A., J. Am. Chem. Soc. 1930., 52, 68.
   2. Gjaldaæk, J. Chr., Acta Chem. Scand. 1952, 6, 623.