IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Ethene with Potassium nitrate and Water
Components:
   (1) Ethene; C2H4; [74-85-1]  NIST Chemistry WebBook for detail
   (2) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (3) Potassium nitrate; KNO3; [7757-79-1]  NIST Chemistry WebBook for detail
Original Measurements:
   Clever, H. L.; Baker, E. R.; Hale, W. R., J. Chem. Eng. Data 1970, 15, 411-3.

 Variables:
   Temperature = 303.15 K
   Pressure = 101.3 kPa
   Concentration = 0 - 1.08 c2/mol dm –3)

 Prepared By:
   H.L. Clever

 Experimental Data:   (Subscripts 1,2,3, ..., in column headings refer to components 1,2,3, ...)
   
Ethene Solubility at 101.3 kPa
t/°CT/KTemp Note103 * Concentration C1 [mol dm–3]Concentration C2 [mol dm–3]Concentration NoteSolubility [c1°/c1]Solubility NoteRemark(s)
30.0303.15a4.41 (a)0Potassium Nitrate1.000b Ratio98.2 ± 0.5(5) cm3 (STP) cm−3
30.0303.15a4.32 (a)0.0084Potassium Nitrate1.021b Ratio96.2 cm3 (STP) cm−3
30.0303.15a4.17 (a)0.0173Potassium Nitrate1.059b Ratio92.7 ± 1.0(2) cm3 (STP) cm−3
30.0303.15a4.03 (a)0.0280Potassium Nitrate1.096b Ratio89.6 ± 3.0(2) cm3 (STP) cm−3
30.0303.15a3.79 (a)0.115Potassium Nitrate1.166b Ratio84.2 ± 3.0(3) cm3 (STP) cm−3
30.0303.15a3.28 (a)0.525Potassium Nitrate1.343b Ratio73.0 ± 5.2(4) cm3 (STP) cm−3
30.0303.15a3.19 (a)1.08Potassium Nitrate1.383b Ratio71.0 ± 1.6(3) cm3 (STP) cm−3
 Notes:
   a  Calculated by the compiler. Molar volume STP, V/cm3 mol–1 = 22,246.
   b  The solubility ratios give salt effect parameters, kscc/dm3 mol–1 = (1/(c2/mol dm–3)) log (c°1/c1), that range from 1.43 at low KNO3 concentration to 0.13 at high KNO3 concentration. The values at low KNO3 concentrations should be used with caution.

 Method/Apparatus/Procedure:
   The apparatus and method were similar to those described by Markham and Kobe1.

Aqueous solution of potassium nitrate were prepared, degassed by refluxing under reduced pressure, and transferred to the solubility apparatus without contact with atmospheric gases. The solubility of ethene at a total pressure of one atm (101.3 kPa) was measured by observing the volume of gas, saturated with water vapor, absorbed by an 88.5 cm3 sample of degassed solution at 30 °C.

The solubilities were calculated for one atm partial pressure ethene assuming Henry's law.

Source and Purity of Materials:
   (1) Ethene. Matheson Co., Inc. Stated to have 99.5 % minimum purity.
   (2) Potassium nitrate. Source not given. Reagent grade.
   (3) Water. Distilled.

 Estimated Errors:
   Solubility: δc1/c1 = ± 0.01
   Temperature: δT/K = ± 0.05

 References:
   1. Markham, A.E.; Kobe, K. A., J. Am. Chem. Soc. 1941, 63, 449.