Components:
(1) Carbon dioxide,
CO2; [124-38-9]
NIST WebBook
(2) Sodium lactate,
C3H5O3Na; [72-17-3]
NIST WebBook
(3) 2-Hydroxypropanoic acid,
C3H6O3; [50-21-5]
NIST WebBook
(4) Water,
H2O; [7732-18-5]
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Original Measurements
Van Slyke, D. D.; Sendroy Jr., J.; Hastings, A. B.; Neill, J. M.; J. Biol. Chem. 1928, 78, 765-99.
Variables:
Ambient temperature: 311.2 K
Pressure: "atmospheric"
Amount concentration (2): C2/mol L-1 = 0 - 0.300; C3/mol L-1 = 0.100 - 0.300
Prepared by:
Method/Apparatus/Procedure:
Two procedures were used for saturating solutions with CO2:
Saturation by bubbling (B). The solution was placed in the saturating tube, the lower end of which was connected through a wash bottle with a Kipp CO2 generator. The tube and wash bottle were immersed in a constant temperature bath. CO2 gas was bubbled through it rapidly for 30 minutes. The wash bottle was replaced by a mercury reservoir and the free gas was driven completely out of the saturating tube by admitting mercury underneath the solution. The CO2 contents of the solutions were determined in the manometric gas apparatus (Refs 1 and 2).
Saturation in rotating tonometer (T).
The technique used was that described by Austin et al. (Ref. 3).
Both procedures gave identical results with solutions of acids and salts.
Source and Purity of Materials:
- From a Kipp CO2 generator.
- Na-lactate solutions were made by adding known excess of lactic acid to solutions of NaHCO3.
- Not specified.
- Distilled.
Estimated Errors:
Ambient temperature: δT/K = ±0.1
Mass concentration (m/v) (1): δα/α = ±0.005
References
1
Van Slyke, D. D.; Neill, J. M.; J. Biol. Chem. 1924. 61, 523-35.
2
Van Slyke, D. D.; Sendroy Jr., J.; J. Biol. Chem. 1927, 73, 127.
3
Austin, J. H.; Cullen, G. E.; Hastings, A. B.; McLean, F. C.; Peters, J. P.; Van Slyke, D. D.; J. Biol. Chem. 1922, 54, 121.
Experimental Values:
| T (K) | T (°C) | C2 (mol/L) | α (cm3(g) cm-3(l) atm-1) | β | C3 (g/L) | Method |
|---|---|---|---|---|---|---|
| 311.2 | 38.0 | 0.0 | 5.436 x 10-1 | 5.508 x 10-1 | 3.00 x 10-1 | B |
| 311.2 | 38.0 | 0.0 | 5.473 x 10-1 | 5.540 x 10-1 | 1.00 x 10-1 | B |
| 311.2 | 38.0 | 0.0 | 5.434 x 10-1 | 5.569 x 10-1 | 1.50 x 10-1 | B |
| 311.2 | 38.0 | 1.50 x 10-1 | 5.214 x 10-1 | 5.303 x 10-1 | 1.00 x 10-1 | B |
| 311.2 | 38.0 | 1.50 x 10-1 | 5.220 x 10-1 | 5.350 x 10-1 | 3.00 x 10-1 | T |
| 311.2 | 38.0 | 3.00 x 10-1 | 5.023 x 10-1 | 5.174 x 10-1 | 1.50 x 10-1 | B |
| 311.2 | 38.0 | 3.00 x 10-1 | 4.980 x 10-1 | 5.207 x 10-1 | 1.50 x 10-1 | T |
(a) Calculated by the compiler. (b) B: saturation by bubbling; T: saturation in rotating tonometer. (c) 1 mmHg = 133.322 Pa = 1.33322 x 10-3 bar (d) α = Bunsen coefficient [cm3 (STP) cm-3 atm-1]. (e) S1 = Kuenen coefficient [cm3 (STP) g-1 atm-1].
