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Solubility System: Carbon dioxide with Sodium nitrate and Water (Original Report)

Variables:
Temperature: 273.35 K and 298.15 K
Pressure: 101.325 kPa
Concentration: m2/mol kg-1 = 0 - 4
Prepared By:
D.M. Mason
Experimental Remarks:
The authors fitted their data to equations:
Sm/So = am2 + 1/(1 + bm2), as follows:
t/°C a b
0.2 -0.0054     0.240
25     -0.0050     0.150
Experimental Data:
T (K)T (°C)m2 (mol/kg)α [Note: a]S [Note: b]
273.350.201.70231.7025
273.350.20.21.61671.6247
273.350.20.51.5041.5229
273.350.230.8840.9589
273.350.240.40550.5099
298.152500.75650.7587
298.15250.10.74150.7458
298.15250.20.72890.7352
298.15250.50.69460.7069
298.152510.63520.6562
298.152520.54060.5758
298.152530.46590.5109
298.152540.24740.3151

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 the gas is agitated with a measured quantity of gas-free liquid and the decrease in volume of solution-saturated gas is measured in a burette over mercury. The pressure was adjusted to yield one atmosphere partial pressure of carbon dioxide. The volume of gas was reduced to 0°C by the ideal gas law. Experiments were conducted to show that the agitation did not cause super-saturation.

Source and Purity of Materials:

(1) Commercial cylinder, 99.8% pure.
(2) Analytical grade.
(3) Distilled and degassed.

Estimated Errors

Temperature: δT/K = < ±0.1 at 0.2°C, ±0.03 at 25°C (authors)
Solubility: δα/α, δS/S = ±0.002 (authors)

References:

No references.

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