IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Carbon dioxide with Potassium nitrate and Water

Components:
   (1) Potassium nitrate; KNO3; [7757-79-1]  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:
   Gerecke, J., Diss. Dr. rer. Nat. 1969, Hochsch. "Carl Schorlemmer", Leuna-Merseburg, DDR.

Variables:
   Temperature = 288.15 K to 328.15 K
   Pressure = 101.325 kPa
   Concentration = c₂/mol dm^-3 = 0 - 2

Prepared By:
   D.M. Mason

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


t/°C	T/K	Concentration C₂ [mol/dm³]	Keunen coefficient, S	S Note	α	α Note
15	288.15	0	-	b	0.990	a
15	288.15	0.25	0.961	b	0.951	a
15	288.15	0.5	0.941	b	0.920	a
15	288.15	1	0.925	b	0.888	a
15	288.15	2	0.878	b	0.807	a
20	293.15	0	-	b	0.860	a
20	293.15	0.25	0.852	b	0.843	a
20	293.15	0.5	0.8115	b	0.792	a
20	293.15	1	0.807	b	0.773	a
20	293.15	2	0.773	b	0.709	a
25	298.15	0	0.5173	b	0.758	a
25	298.15	0.25	0.752	b	0.744	a
25	298.15	0.5	0.738	b	0.720	a
25	298.15	1	0.6841	b	0.681	a
25	298.15	2	0.695	b	0.636	a
30	303.15	0	-	b	0.671	a
30	303.15	0.25	0.661	b	0.653	a
30	303.15	0.5	0.6535	b	0.637	a
30	303.15	1	0.630	b	0.602	a
30	303.15	2	0.621	b	0.568	a
35	308.15	0	-	b	0.605	a
35	308.15	0.25	0.576	b	0.568	a
35	308.15	0.5	0.567	b	0.552	a
35	308.15	1	0.548	b	0.523	a
35	308.15	2	0.553	b	0.504	a
40	313.15	0	-	b	0.546	a
40	313.15	0.25	0.516	b	0.508	a
40	313.15	0.5	0.499	b	0.485	a
40	313.15	1	0.4885	b	0.465	a
40	313.15	2	0.4935	b	0.449	a
45	318.15	0	-	b	0.482	a
45	318.15	0.25	0.455	b	0.447	a
45	318.15	0.5	0.445	b	0.432	a
45	318.15	1	0.435	b	0.414	a
45	318.15	2	0.443	b	0.402	a
50	323.15	0	-	b	0.436	a
50	323.15	0.25	0.407	b	0.399	a
50	323.15	0.5	0.402	b	0.390	a
50	323.15	1	0.393	b	0.373	a
50	323.15	2	0.400	b	0.362	a
55	328.15	0	-	b	0.392	a
55	328.15	0.25	0.3675	b	0.360	a
55	328.15	0.5	0.363	b	0.351	a
55	328.15	1	0.359	b	0.340	a
55	328.15	2	0.357	b	0.323	a

Notes:
   ^a  α = Bunsen coefficient [cm³ (STP) cm^-3 atm^-1].
   ^b  S= Kuenen coefficient [cm³ (STP) g^-1(H₂O) atm^-1].

Method/Apparatus/Procedure:
   The principle of the Ostwald method was used in which a measured volume of gas-free liquid is stirred in the presence of the gas, and its decrease in volume is measured in a burette over mercury. The volume of liquid was measured at the experimental temperature. For calculation of the Kuenen coefficient, the density of the solution was obtained from Landolt-Börnstein extant 1969. The molar concentration of salt in the liquid was standardized at 20°C. These data are analyzed and discussed further in Ref. 1.

Source and Purity of Materials:
   (1)VEB Leuna Works; 99.8 vol %; the impurity was mostly water (author).
   (2) DDR pro analysis grade by DDR Standard TGL 5021.
   (3) Double distilled.

Estimated Errors:

   Temperature: Not given.

References:
   1. Gerecke, J.; Bittrich, H.J., Wiss. Z. Tech. Hochsch. Chem. "Carl Schorlemmer" Leuna-Merseburg 1971, 13(2), 115-22.