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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Carbon dioxide with Magnesium chloride and Water
Components:
(1) Magnesium chloride; MgCl2; [7786-30-3]
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 - 5.021
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
1.0090
c
70.3
e
0.1
b
1.07
f
273.15
a
96.6
d
0.0732
c
49.2
e
1.0
b
1.53
f
273.15
a
96.6
d
0.1430
c
35.7
e
2.0
b
2.11
f
273.15
a
96.6
d
0.1980
c
24.9
e
3.0
b
3.03
f
273.15
a
96.6
d
0.2530
c
15.6
e
4.0
b
4.83
f
273.15
a
96.6
d
0.3014
c
10.2
e
5.0
b
7.52
f
298.15
a
94.2
d
1.0056
c
30.0
e
0.1
b
1.07
f
298.15
a
94.2
d
1.0680
c
21.8
e
1.0
b
1.47
f
298.15
a
94.2
d
1.1342
c
17.1
e
2.0
b
2.25
f
298.15
a
94.2
d
1.1917
c
9.9
e
3.0
b
3.24
f
298.15
a
94.2
d
1.2948
c
6.7
e
5.0
b
4.83
f
323.15
a
85.4
d
1.0049
c
15.8
e
0.215
b
1.06
f
323.15
a
85.4
d
1.0669
c
15.5
e
1.128
b
1.23
f
323.15
a
85.4
d
1.1119
c
10.9
e
1.831
b
1.52
f
323.15
a
85.4
d
1.1827
c
9.6
e
3.024
b
1.73
f
323.15
a
85.4
d
1.1368
c
8.7
e
4.021
b
1.91
f
323.15
a
85.4
d
1.2862
c
7.5
e
5.021
b
2.22
f
348.15
a
60.3
d
0.9842
c
7.7
e
0.1
b
1.05
f
348.15
a
60.3
d
1.0460
c
7.3
e
1.0
b
1.11
f
348.15
a
60.3
d
1.1109
c
6.6
e
2.0
b
1.23
f
348.15
a
60.3
d
1.1701
c
6.3
e
3.0
b
1.28
f
348.15
a
60.3
d
1.2742
c
5.7
e
5.0
b
1.42
f
363.15
a
30.1
d
0.9751
c
3.3
e
0.1
b
1.04
f
363.15
a
30.1
d
1.0376
c
3.1
e
1.0
b
1.10
f
363.15
a
30.1
d
1.1307
c
2.9
e
2.0
b
1.23
f
363.15
a
30.1
d
1.1629
c
2.7
e
3.0
b
1.27
f
363.15
a
30.1
d
1.2676
c
2.4
e
5.0
b
1.40
f
Notes:
a
Calculated by compiler
b
m
2
= molality of MgCl
2
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. MgCl
2
x6H
2
O was weighed and dissolved in water. The concentration of MgCl
2
in solutions was determined by analyzing Cl
-
concentration via AgNO
3
titration in stock solutions.
(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