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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Carbon dioxide with 1-Heptanesulfonic acid, sodium salt; (sodium 1-heptylsulfonate) and Water
Components:
(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.
Variables:
Temperature = 298.15 K
Concentration =
m
2
/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 CO
2
. 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 m
1
[mol/kg]
m
1
Note
Molality m
2
[mol/kg]
m
2
Note
25
298.15
a
3.32, 3.392*
c
0.0
b
25
298.15
a
3.17
c
0.2
b
25
298.15
a
3.12
c
0.3
b
25
298.15
a
3.05
c
0.4
b
25
298.15
a
3.05
c
0.5
b
25
298.15
a
3.07
c
0.6
b
25
298.15
a
3.16
c
0.8
b
25
298.15
a
3.26
c
1.0
b
25
298.15
a
3.33
c
1.2
b
Notes:
*
Value from Wilhelm, E.; Battino, R.; Wilcock, R. J.
Chem. Rev. 1977, 72, 219
.
a
Added by the compiler.
b
m
2
= molality of sodium 1-heptylsulfonate.
c
m
1
= 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 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: δ
m
1
/mol kg
-1
= 0.02 x 10
-2
Temperature: δ
T
/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.