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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Carbon dioxide with Potassium iodide and Water
Components:
(1) Potassium iodide; KI; [7681-11-0]
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:
Vázquez, G.; Chenlo, F.; Pereira, G.; Peaguda, J., An. Quim. 1994, 90, 324-28.
Variables:
Temperature = 298.1 K
Pressure = 1.013 bar
Concentration =
m
2
/mol kg
-1
= 0.245 - 1.835
Prepared By:
Pirketta Scharlin
Experimental Data:
(Subscripts 1,2,3, ..., in column headings refer to components 1,2,3, ...)
T/K
Density ρ [kg/m
3
]
Density Note
Ostwald coefficient L
Ostwald Note
Concentration C
1
[mol/dm
3
]
Concentration Note
Molality m
2
[mol/kg]
m
2
Note
γ [g/L]
γ Note
298.1
1024
b
0.741
e
0.0303
d
0.245
c
40
a
298.1
1053
b
0.714
e
0.0292
d
0.495
c
80
a
298.1
1082
b
0.692
e
0.0283
d
0.751
c
120
a
298.1
1111
b
0.692
e
0.0283
d
1.014
c
160
a
298.1
1141
b
0.665
e
0.0272
d
1.280
c
200
a
298.1
1165
b
0.658
e
0.0269
d
1.563
c
240
a
298.1
1199
b
0.653
e
0.0267
d
1.835
c
280
a
Notes:
a
γ
2
= mass concentration of KI
b
p
= density of aqueous KI solution
c
m
2
= molality of KI; calculated by the compiler.
d
c
1
= solubility of CO
2
e
L
= Ostwald coefficient [cm
3
cm
-3
]
Method/Apparatus/Procedure:
The apparatus is a combination of previous designs (Refs 1 and 2). It was modified to achieve a more accurate determination of the volume of the absorbent liquid. The apparatus measures the volume of absorbed gas as the volume of mercury that must be supplied to the system in order to restore the initial pressure.
The raw solubility data obtained are gas/ liquid volume ratios. A detailed description of apparatus, method and procedure is given in Ref. 3.
Source and Purity of Materials:
(1) Commercial, purity 99.5 mole %
(2) Merck. Grade not given.
(3) Distilled and degassed.
Estimated Errors:
Solubility: δ
c
1
/
c
1
< ± 1 % [estimated by compiler on the basis of the information in Ref. 3]
Temperature: δ
T
/K = ± 0.1
Pressure: δP/bar = ± 0.001
References:
1. Alvarez, J.R.; Fernandez, A.; Coll, A., Ing. Quim. 1984, 16, 67.
2. Haimour, N., J. Chem. Eng. Data 1990, 35, 177.
3. Vazquez, G.; Chenlo, F.; Pereira, G.; Peaguda, J., J. Chem. Eng. Data 1994, 39, 639.