IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Carbon dioxide with Sodium iodide and Water

Components:
   (1) Sodium iodide; NaI; [7681-82-5]  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:
   Gjaldbæk, J. Chr. Acta Chem. Scand. 1953, 7, 537-44. Rosenthal, W., Thès. fac. sci. Univ. Strasbourg (France) 1954.

Variables:
   Temperature = 293.15 K
   Concentration = c₂/mol dm^-3 = 0 - 6.012

Prepared By:
   H.L. Clever

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


T/K	Ostwald coefficient L [cm³/cm³]	Ostwald Note	Concentration C₂ [mol/dm³]	Concentration Note	Salt Effect [dm³/mol]	Salt Note
293.15	0.879	a,b	0	a	-	c,d
293.15	0.650	a,b	0.161	a	0.0815	c,d
293.15	0.415	a,b	4.27	a	0.0765	c,d
293.15	0.322	a,b	6.012	a	0.0725	c,d

Notes:
   ^a  Original data.
   ^b  Ostwald coefficient.
   ^c   Setchenov constant; K_scc = (1/c₂) lg(L⁰/L).
   ^d  Calculated by compiler

Method/Apparatus/Procedure:
   The prepared solvent and solution were charged into an evacuated cell after degassing, and the mass of solvent was determined by weight. Gas was introduced into the cell from a measuring buret in which the gas was stored over mercury. The cell was agitated while the gas pressure was maintained by adjusting the gas volume.The Ostwald coefficient was determined from the mass of solvent and the volume of gas absorbed. Solubilities were measured at pressures above and below atmospheric.

Source and Purity of Materials:
   (1) Source and purity not given. An aqueous "soda" solution absorbed 99.8 % of the gas.
   (2) Source and purity not given. Recrystallized from water and dried.
   (3) Boiled to remove carbon dioxide.

Estimated Errors:
   Solubility: δL/L = ± 0.02 (compiler)
   Temperature: δT/K = ± 0.2
   Pressure: δp/kPa = ± 0.1