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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Carbon dioxide with Potassium sulfate and Water
Components:
(1) Potassium sulfate; K2SO4; [7778-80-5]
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:
He, S.; Morse, J.W., Geochim. Cosmochim. Acta 1993, 57, 3533-54.
Variables:
Temperature = 273.15 K to 363.15 K
Pressure = 0.1032 MPa
Concentration =
m
2
/mol kg
-1
= 0.01 - 0.9
Prepared By:
Pirketta Scharlin
Experimental Data:
(Subscripts 1,2,3, ..., in column headings refer to components 1,2,3, ...)
T/K
Temp Note
10
2
* Pressure [atm]
Pressure Note
Density ρ [g/cm
3
]
Density Note
10
3
* Molality m
1
[mol/kg]
m
1
Note
Molality m
2
[mol/kg]
m
2
Note
γ
γ Note
273.15
a
96.6
d
1.0017
c
74.1
e
0.01
b
1.02
f
273.15
a
96.6
d
1.0152
c
69.3
e
0.1
b
1.09
f
273.15
a
96.6
d
1.0291
c
67.1
e
0.2
b
1.14
f
273.15
a
96.6
d
1.0425
c
64.7
e
0.3
b
1.16
f
273.15
a
96.6
d
1.0553
c
59.8
e
0.4
b
1.26
f
298.15
a
94.2
d
1.0109
c
29.9
e
0.1
b
1.07
f
298.15
a
94.2
d
1.0246
c
28.1
e
0.2
b
1.10
f
298.15
a
94.2
d
1.0372
c
27.9
e
03
b
1.15
f
298.15
a
94.2
d
1.0505
c
26.4
e
0.4
b
1.22
f
298.15
a
94.2
d
1.0747
c
24.4
e
0.6
b
1.31
f
323.15
a
85.4
d
0.9917
c
17.9
e
0.02
b
1.02
f
323.15
a
85.4
d
1.0017
c
17.3
e
0.1
b
1.06
f
323.15
a
85.4
d
1.0525
c
15.5
e
0.5
b
1.18
f
323.15
a
85.4
d
1.0893
c
14.6
e
0.81
b
1.25
f
348.15
a
60.3
d
0.9884
c
7.8
e
0.1
b
1.04
f
348.15
a
60.3
d
1.0140
c
7.5
e
0.3
b
1.08
f
348.15
a
60.3
d
1.0388
c
7.4
e
0.5
b
1.09
f
348.15
a
60.3
d
1.0629
c
7.1
e
0.7
b
1.15
f
348.15
a
60.3
d
1.0862
c
6.7
e
0.9
b
1.20
f
363.15
a
30.1
d
0.9788
c
3.4
e
0.1
b
1.02
f
363.15
a
30.1
d
1.0046
c
3.3
e
0.3
b
1.05
f
363.15
a
30.1
d
1.0292
c
3.2
e
0.5
b
1.08
f
363.15
a
30.1
d
1.0523
c
3.1
e
0.7
b
1.11
f
363.15
a
30.1
d
1.0762
c
3.0
e
0.9
b
1.14
f
Notes:
a
Calculated by the compiler.
b
m
2
= molality of K
2
SO
4
c
p
= density of solvent
d
p
1
= partial pressure of CO
2
e
m
1
= molality of CO
2
f
γ
1
= activity coefficient of CO
2
Method/Apparatus/Procedure:
Either pure CO
2
gas or CO
2
-N
2
mixtures were used in the experiments to maintain a constant P(CO
2
). The CO
2
-N
2
mixtures were made by pumping predetermined amounts of CO
2
and N
2
into a gas tank and their composition was verified by gas chromatography.
CO
2
or CO
2
-N
2
gas mixtures were equilibrated with the aqueous solutions in a series of stirred water-jacketed reaction vessels with condensers. The gas was premoistured by first passing it through distilled water at the temperature of experiment. Fine bubbles were obtained by using gas-dispersion tubes. The bubbling rate was 90- 95 mL min
-1
.
The mole fraction of CO
2
in the CO
2
-N
2
mixture was determined using a Hewlett Packard (5790A) gas chromatograph.
Source and Purity of Materials:
(1) Commercial; purity 99.9 %
(2) Source not mentioned. Analytical reagent-grade which met ACS specifications.
Vacuum-dried before use.
(3) 18 MΩ water obtained from a Milli-Q Super-Q water system.
Estimated Errors:
Solubility: δ
m
1
/
m
1
= ± 0.012
δγ
1
/γ
1
= ± 0.04
Temperature: δ
T
/K = ± 0.1