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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Carbon dioxide with Sodium chloride and Water
Components:
(1) Sodium chloride; NaCl; [7647-14-5]
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
= 0.1 - 6.14
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
1.0214
c
63.6
e
0.5
b
1.18
f
273.15
a
96.6
d
1.0411
c
57.8
e
1.0
b
1.30
f
273.15
a
96.6
d
1.0787
c
45.7
e
2.0
b
1.65
f
273.15
a
96.6
d
1.1140
c
39.5
e
3.0
b
1.90
f
273.15
a
96.6
d
1.1460
c
31.7
e
4.0
b
2.38
f
273.15
a
96.6
d
1.1776
c
26.9
e
5.0
b
2.79
f
273.15
a
96.6
d
1.2095
c
21.9
e
6.0
b
3.44
f
298.15
a
3.9
d
1.0189
c
1.20
e
0.5
b
1.10
f
298.15
a
3.9
d
1.0363
c
1.10
e
1.0
b
1.18
f
298.15
a
3.9
d
1.0700
c
0.90
e
2.0
b
1.48
f
298.15
a
3.9
d
1.1026
c
0.80
e
3.0
b
1.76
f
298.15
a
3.9
d
1.1340
c
0.60
e
4.0
b
2.25
f
298.15
a
3.9
d
1.1642
c
0.50
e
5.0
b
2.61
f
298.15
a
3.9
d
1.1974
c
0.40
e
6.14
b
3.21
f
323.15
a
85.4
d
1.0081
c
15.5
e
0.5
b
1.07
f
323.15
a
85.4
d
1.0262
c
14.7
e
1.0
b
1.13
f
323.15
a
85.4
d
1.0608
c
13.3
e
2.0
b
1.25
f
323.15
a
85.4
d
1.0934
c
10.6
e
3.0
b
1.56
f
323.15
a
85.4
d
1.1240
c
9.2
e
4.0
b
1.81
f
323.15
a
85.4
d
1.1524
c
8.4
e
5.0
b
1.98
f
323.15
a
85.4
d
1.1824
c
7.4
e
6.14
b
2.25
f
348.15
a
60.3
d
0.9795
c
7.8
e
0.1
b
1.03
f
348.15
a
60.3
d
1.0120
c
7.4
e
1.0
b
1.09
f
348.15
a
60.3
d
1.0463
c
7.0
e
2.0
b
1.15
f
348.15
a
60.3
d
1.1090
c
6.4
e
4.0
b
1.26
f
348.15
a
60.3
d
1.1638
c
5.9
e
6.0
b
1.37
f
363.15
a
30.1
d
0.9624
c
3.4
e
0.1
b
1.02
f
363.15
a
30.1
d
1.0028
c
3.2
e
1.0
b
1.06
f
363.15
a
30.1
d
1.0373
c
3.1
e
2.0
b
1.12
f
363.15
a
30.1
d
1.1002
c
2.8
e
4.0
b
1.21
f
363.15
a
30.1
d
1.1559
c
2.6
e
6.0
b
1.30
f
Notes:
a
Calculated by the compiler.
b
m
2
= molality of NaCl
c
ρ = 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