Components:
(1) Ethylene,
C2H4; [74-85-1]
NIST WebBook
(2) Potassium nitrate,
KNO3; [7757-79-1]
NIST WebBook
(3) Water,
H2O; [7732-18-5]
NIST WebBook
Original Measurements
Clever, H. L.; Baker, E. R.; Hale, W. R.; J. Chem. Eng. Data 1970, 15, 411-3.
Variables:
Ambient temperature: 303.15 K
Pressure: 101.3 kPa
Amount concentration (2): C2/mol dm-3 = 0 - 1.08
Prepared by:
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:
- Ethene. Matheson Co., Inc. Stated to have 99.5% minimum purity.
- Potassium nitrate. Source not given. Reagent grade.
- Water. Distilled.
Estimated Errors:
Ambient temperature: δT/K = ±0.05
Mass concentration (m/v) (1): δc1/c1 = ±0.01
References
1 Markham, A. E.; Kobe, K. A.; J. Am. Chem. Soc. 1941, 63, 449.
Experimental Values:
Ethene Solubility at 101.3 kPa
| T (K) | T (°C) | C2 (mol/dm3) | C1 (mol/dm3)a | Sr |
|---|---|---|---|---|
| 303.15 | 30.0 | 0.0 | 4.41 x 10-3 | 1.0 |
| 303.15 | 30.0 | 8.4 x 10-3 | 4.32 x 10-3 | 1.021 |
| 303.15 | 30.0 | 1.73 x 10-2 | 4.17 x 10-3 | 1.059 |
| 303.15 | 30.0 | 2.80 x 10-2 | 4.03 x 10-3 | 1.096 |
| 303.15 | 30.0 | 1.15 x 10-1 | 3.79 x 10-3 | 1.166 |
| 303.15 | 30.0 | 5.25 x 10-1 | 3.28 x 10-3 | 1.343 |
| 303.15 | 30.0 | 1.08 | 3.19 x 10-3 | 1.383 |
(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.
