IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Carbon dioxide with Water

Components:
   (1) Carbon dioxide; CO2; [124-38-9]  NIST Chemistry WebBook for detail
   (2) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Harned, H.S.; Davis, R. Jr., J. Am. Chem. Soc. 1943, 65, 2030-7.

Variables:
   Temperature = 273.15 K to 323.15 K
   Pressure = 101.325 kPa

Prepared By:
   Rosa Crovetto

Experimental Data:   (Subscripts 1,2,3, ..., in column headings refer to components 1,2,3, ...)


t/°C	T/K	Temp Note	Pressure (compiler) [bar]	10² * Keunen coefficient, S	S Note	Mole Fraction (x₁)	x₁ Note
0	273.15	a	1.019	7.726	b	1.390	a
0	273.15	a	1.019	7.676	b	1.381	a
5	278.15	a	1.022	6.402	b	1.152	a
10	283.15	a	1.026	5.359	b	0.9645	a
10	283.15	a	1.026	5.367	b	0.9659	a
15	288.15	a	1.030	4554	b	0.8197	a
20	293.15	a	1.037	3.923	b	0.7062	a
20	293.15	a	1.037	3.928	b	0.7071	a
25	298.15	a	1.045	3.438	b	0.6190	a
25	298.15	a	1.045	3.458	b	0.6226	a
30	303.15	a	1.056	3.056	b	0.5448	a
30	303.15	a	1.056	3.021	b	0.5439	a
35	308.15	a	1.070	2.678	b	0.4822	a
40	313.15	a	1.087	2.407	b	0.4334	a
40	313.15	a	1.087	2.407	b	0.4334	a
45	318.15	a	1.109	2.192	b	0.3947	a
50	323.15	a	1.137	1.982	b	0.3569	a
50	323.15	a	1.137	1.969	b	0.3546	a

Notes:
   ^a  Calculated by the compiler.
   ^b  S = m₁/P₁ where m₁ is the molality of CO₂ [mol kg^-1].
The S values are at P₁ = 1 atm.

Method/Apparatus/Procedure:
   The same apparatus and method were used for measurements of solubility and electromotive force. A detailed description of the experimental procedure is available in the source.
Equilibrium in the cell was attained by bubbling CO₂ through the solvent while gently rocking the thermostatted cell. Pressure was maintained constant at 1 atm. The concentration was determined by titrating about 90 cm³ of solution with excess standard Ba(OH)₂ solution and backtitrating the excess.

Source and Purity of Materials:
   (1) From commercial tank. Purity 99.67 % ± 0.05 %.
   (2) Quality not stated. Degassed by CO₂ bubbling and evacuation.

Estimated Errors:

   Temperature: δS = ± 0.2 % (By authors)