Solubility System: Carbon dioxide with Sodium nitrate and Water (Original Report)
(2) Sodium nitrate, NaNO3; [7631-99-4] NIST Chemistry WebBook
(3) Water, H2O; [7732-18-5] NIST Chemistry WebBook
Pressure: 101.325 kPa
Concentration: m2/mol kg-1 = 0 - 4
Sm/So = am2 + 1/(1 + bm2), as follows:
t/°C a b
0.2 -0.0054     0.240
25     -0.0050     0.150
|T (K)||T (°C)||m2 (mol/kg)||α [Note: a]||S [Note: b]|
a) α = Bunsen coefficient [cm3 (STP) cm-3 atm-1].
b) S = Kuenen coefficient [cm3 (STP) g-1 (H2O) atm-1].
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.
(1) Commercial cylinder, 99.8% pure.
(2) Analytical grade.
(3) Distilled and degassed.
Temperature: δT/K = < ±0.1 at 0.2°C, ±0.03 at 25°C (authors)
Solubility: δα/α, δS/S = ±0.002 (authors)