Components:

(1) Carbon dioxide, CO₂; [124-38-9] NIST WebBook
(2) Cetyltrimethylammonium bromide, C₁₉H₄₂N.Br; [57-09-0] NIST WebBook
(3) Water, H₂O; [7732-18-5] NIST WebBook

Original Measurements

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

Variables:

Ambient temperature: 298.15 K
Molality (2): m₂/mol kg^-1 = 0.0 - 0.4

Prepared by:

H.L. Clever

Method/Apparatus/Procedure:

The apparatus and method are described in earlier papers (1, 2). Solubility is determined in a thermostatted, 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. Cetyltrimethylammonium bromide. Lancaster Synthesis Ltd. Stated to be 98.0%.
3. Water. Nothing specified, but have used doubly distilled water in earlier work.

Estimated Errors:

Ambient temperature: δT/K not specified.
Mass concentration (m/v) (1): δm₁/mol kg^-1 = 0.02 × 10^-2

References

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