IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Carbon dioxide with P-[ [p-(dimethylamino)phenyl]azo] benzenesulfonic acid, sodium salt, (methyl orange) and Water

Components:
   (1) P-[ [p-(dimethylamino)phenyl]azo] benzenesulfonic acid, sodium salt, (methyl orange); C14H14N3O3SNa; [547-58-0]  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:
   Findlay, A.; Shen, B., J. Chem. Soc. 1912, 101, 1459-68.

Variables:
   Temperature = 298.15 K
   Pressure = 0.968 bar to 1.792 bar
   Concentration = 10²_γ2/g cm^-3 = 0.309 - 0.857

Prepared By:
   C. L. Young

Experimental Remarks:

   Solubility in water: Ostwald coefficient L = 0.825 cm³ cm^-3.

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


T/K	Pressure [bar]	Density ρ [g/cm³]	Keunen coefficient, S	S Note	10² * γ [g/cm³]	γ Note
298.15	0.968	0.998	0.831	b	0.309	a
298.15	1.097	0.998	0.833	b	0.309	a
298.15	1.220	0.998	0.829	b	0.309	a
298.15	1.408	1.000	0.827	b	0.428	a
298.15	1.588	1.000	0.826	b	0.428	a
298.15	1.759	1.000	0.826	b	0.428	a
298.15	0.984	1.002	0.855	b	0.593	a
298.15	1.117	1.002	0.850	b	0.593	a
298.15	1.243	1.002	0.844	b	0.593	a
298.15	1.433	1.004	0.838	b	0.857	a
298.15	1.620	1.004	0.835	b	0.857	a
298.15	1.792	1.004	0.831	b	0.857	a
298.15	0.976	0.998	0.900	b	0.309	a
298.15	1.109	0.998	0.887	b	0.309	a
298.15	1.232	0.998	0.880	b	0.309	a
298.15	1.424	1.000	0.864	b	0.428	a
298.15	1.612	1.000	0.855	b	0.428	a
298.15	1.780	1.000	0.850	b	0.428	a
298.15	0.972	1.002	0.975	b	0.593	a
298.15	1.105	1.002	0.952	b	0.593	a
298.15	1.224	1.002	0.936	b	0.593	a
298.15	1.417	1.004	0.915	b	0.857	a
298.15	1.604	1.004	0.899	b	0.857	a
298.15	1.768	1.004	0.890	b	0.857	a

Notes:
   ^a  γ = mass concentration of salt
   ^b  S = concentration of gas in liquid phase/concentration of gas in gaseous phase

Method/Apparatus/Procedure:
   Volumetric static method. Care was taken to reduce dead space because of small amounts of gas absorbed. Apparatus similar to that described in Ref. 1.

Source and Purity of Materials:
   (1) Purity 99.95 mole %.
   (2) No details given.
   (3) No details given.

Estimated Errors:
   Solubility: δS = ± 1 % (estimated by compiler)
   Temperature: δT/K = ± 0.1 (estimated by compiler)

References:
   1. Findlay, A.; Creighton, H.J.M., J. Chem. Soc. 1910, 97, 536.