SDS Volume (2600)
Volume 62. Carbon Dioxide in Water and Aqueous Electrolyte Solutions, p None
Original Measurements
Markham, A. E.; Kobe, K. A.; J. Am. Chem. Soc. 1941, 63, 449.
Variables:
Room Temp:
273.35 - 313.15
$\pu{K}$
Pressure:
101.325
$\pu{kPa}$
Molality (2):
m2/mol kg-1 = 0 - 2
mol/kg
Prepared by:
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:
- Commercial cylinder, 99.8% pure.
- Analytical grade.
- Distilled and degassed.
Estimated Errors:
Ambient temperature: δT/K = < ±0.1 at 0.2°C, ±0.03 at other temperatures (authors)
Mass concentration (m/v) (1): δα/α, δS/S = ±0.002 (authors)
Components:
- Carbon dioxide, $\ce{ CO2 }$; [124-38-9] NIST WebBook
- Magnesium sulfate, $\ce{ MgSO4 }$; [7487-88-9] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
The authors fitted their data to equations:
Sm/So = am2 + 1/(1 + bm2), as follows:
t/°C a b
0.2 -0.0852 0.701
25 -0.0808 0.575
40 -0.0736 0.545
| $T$ ($\pu{K}$) | $T$ (°C) | m2 (mol/kg) | α ($\pu{cm3(g) cm-3(l) atm-1}$) | $S$ |
|---|---|---|---|---|
| 273.35 | 0.2 | 0.0 | 1.7023 | 1.7025 |
| 273.35 | 0.2 | 0.5 | 1.1988 | 1.1986 |
| 273.35 | 0.2 | 1 | 0.8448 | 0.8470 |
| 273.35 | 0.2 | 2 | 0.4128 | 0.4201 |
| 298.15 | 25 | 0.0 | 0.7565 | 0.7587 |
| 298.15 | 25 | 0.5 | 0.5580 | 0.5606 |
| 298.15 | 25 | 1 | 0.4147 | 0.4186 |
| 298.15 | 25 | 2 | 0.2250 | 0.2306 |
| 313.15 | 40 | 0.0 | 0.5133 | 0.5173 |
| 313.15 | 40 | 0.5 | 0.3814 | 0.3852 |
| 313.15 | 40 | 1 | 0.2948 | 0.2992 |
| 313.15 | 40 | 2 | 0.1658 | 0.1708 |
(b) S1 = Kuenen coefficient [cm3 (STP) g-1(H2O) atm-1].
(a) α = Bunsen coefficient [cm3 (STP) cm-3 atm-1].
