IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Carbon dioxide with Ferric hydroxide (colloidal) and Water

Components:
   (1) Ferric hydroxide (colloidal); Fe(OH)3; [1309-33-7]  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:
   Gatterer, A., J. Chem. Soc. (London) 1926, 129, 299-316.

Variables:
   Temperature = 278.12 K to 298.15 K
   Concentration = c₂/mol L^-1 = 0 - 0.967

Prepared By:
   Pirketta Scharlin

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


t/°C	T/K	Temp Note	Ostwald coefficient L	Ostwald Note	Concentration C₂ [mol/L]	Concentration Note
4.97	278.12	a	1.446	c	0	b
4.97	278.12	a	1.471	c	0.071	b
4.97	278.12	a	1.503	c	0.144	b
4.97	278.12	a	1.534	c	0.293	b
4.97	278.12	a	1.584	c	0.513	b
4.97	278.12	a	1.680	c	0.967	b
9.95	283.10	a	1.240	c	0	b
9.95	283.10	a	1.267	c	0.071	b
9.95	283.10	a	1.297	c	0.144	b
9.95	283.10	a	1.326	c	0.293	b
9.95	283.10	a	1.379	c	0.513	b
9.95	283.10	a	1.470	c	0.967	b
14.96	288.11	a	1.070	c	0	b
14.96	288.11	a	1.095	c	0.071	b
14.96	288.11	a	1.123	c	0.144	b
14.96	288.11	a	1.154	c	0.293	b
14.96	288.11	a	1.204	c	0.513	b
14.96	288.11	a	1.291	c	0.967	b
19.98	293.13	a	0.936	c	0	b
19.98	293.13	a	0.9610	c	0.071	b
19.98	293.13	a	0.9870	c	0.144	b
19.98	293.13	a	1.016	c	0.293	b
19.98	293.13	a	1.066	c	0.513	b
19.98	293.13	a	1.149	c	0.967	b
25.00	298.15	a	0.826	c	0	b
25.00	298.15	a	0.8533	c	0.071	b
25.00	298.15	a	0.8764	c	0.144	b
25.00	298.15	a	0.9063	c	0.293	b
25.00	298.15	a	0.9526	c	0.513	b
25.00	298.15	a	1.032	c	0.967	b

Notes:
^a Calculated by the compiler.
^b c₂ means the concentration of entities 1/3 Fe(OH)₃. c₂ = c{1/3 Fe(OH) ₃} M{1/3 Fe(OH) ₃} = 35.621 g mol^-1

Author: "Although it is uncertain whether the colloids in question have definite chemical formula, yet for the sake of clearness the gram-equivalent of ferric hydroxide was taken as 1/3 Fe(OH) ₃ = 35.621."
   ^c  L = Ostwald coefficient [cm³ cm^-3]. The values represented in table are mean values of measurements.

Method/Apparatus/Procedure:
   The method of Ostwald was employed.¹ The solutions were freed from air by boiling in a vacuum and, without contact with air, transferred to the vaccum mixing vessel at 25 °C. The gas was saturated with water vapor at the same temperature. Five measurements were made with a given solution at five different temperatures, the process being repeated after an interval of several hours to check the former result.

Source and Purity of Materials:
   (1) Carefully washed. Purity of CO₂ was confirmed by the value obtained for its solubility in distilled water.
   (2) A solution of pure ferric hydroxide in acetic acid was diluted and boiled until the ratio of acetic acid to ferric hydroxide became 1:30 - 1:60. The solution was then evaporated under reduced pressure.
   (3) Not specified.

Estimated Errors:
   Solubility: δL/L = ± 0.004 (by author)

References:
   1. Ostwald, W. ; Luther, R. Handbuch der Physicochemischen Mussungen, 3rd ed. 1910, p. 246.