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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Carbon dioxide with Sodium lactate and 2-Hydroxypropanoic acid; (lactic acid) and Water
Components:
(1) Sodium lactate; C3H5O3Na; [920-49-0]
NIST Chemistry WebBook
for detail
(2) 2-Hydroxypropanoic acid; (lactic acid); C3H6O3; [50-21-5]
NIST Chemistry WebBook
for detail
(3) Carbon dioxide; CO2; [124-38-9]
NIST Chemistry WebBook
for detail
(4) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Van Slyke, D. D.; Sendroy, J., Jr.; Hastings, A. B.; Neill, J. M., J. Biol. Chem. 1928, 78, 765-99.
Variables:
Temperature = 311.2 K
Pressure = "atmospheric"
Concentration =
c
2
/mol L
-1
= 0 - 0.300
c
3
/mol L
-1
= 0.100 - 0.300
Prepared By:
Pirketta Scharlin
Experimental Data:
(Subscripts 1,2,3, ..., in column headings refer to components 1,2,3, ...)
t/°C
T/K
Temp Note
Pressure [mmHg]
Pressure Note
Concentration C
2
[mol/L]
Concentration C
3
[mol/L]
Langmuir's parameter, C
H
[mol/L]
Keunen coefficient, S
S Note
α
α Note
Method/Comments
Method Note
38.0
311.2
a
712.9
c
0
0.300
0.150
0.5508
e
0.5436
d
B
b
38.0
311.2
a
714.4
c
0
0.100
0.150
0.5540
e
0.5473
d
B
b
38.0
311.2
a
712.9
c
0
0.150
0.300
0.5569
e
0.5434
d
B
b
38.0
311.2
a
700.8
c
0.150
0.100
0.100
0.5303
e
0.5214
d
B
b
38.0
311.2
a
707.0
c
0.150
0.300
0.150
0.5350
e
0.5220
d
T
b
38.0
311.2
a
700.8
c
0.300
0.150
0.100
0.5174
e
0.5023
d
B
b
38.0
311.2
a
707.0
c
0.300
0.150
0.300
0.5207
e
0.4980
d
T
b
Notes:
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 [cm
3
(STP) cm
-3
atm
-1
].
e
S
1
= Kuenen coefficient [cm
3
(STP) g
-1
atm
-1
].
Method/Apparatus/Procedure:
Two procedures were used for saturating solutions with CO
2
:
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 CO
2
generator. The tube and wash bottle were immersed in a constant temperature bath. CO
2
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 CO
2
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:
(1) From a Kipp CO
2
generator.
(2) Na-lactate solutions were made by adding known excess of lactic acid to solutions of NaHCO
3
.
(3) Not specified.
(4) Distilled.
Estimated Errors:
Solubility: δα/α = ± 0.005
Temperature: δ
T
/K = ± 0.1
References:
1. Van Slyke, D. D.; Neill, J. M. J. Biol. Chem. 1924, 61, 523.
2. Van Slyke, D. D.; Sendroy, J., Jr. J. Biol. Chem. 1927, 73, 127.
3. Austins, J. H.; Cullen, G.E.; Hastings, A. B.; McLean, F.C.; Peters, J. P.; Van Slyke, D. D. J. Biol. Chem. 1922, 54, 121.