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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Carbon dioxide with Potassium dihydrogen phosphate and Water
Components:
(1) Potassium dihydrogen phosphate; KH2PO4; [7778-77-0]
NIST Chemistry WebBook
for detail
(2) Carbon dioxide; CO2; [124-38-9]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Gerecke, J., Diss. Dr. rer. Nat. 1969, Hochsch. "Carl Schorlemmer", Leuna-Merseburg, DDR.
Variables:
Temperature = 288.15 K to 333.15 K
Pressure = 288.15 K to 333.15 K
Concentration =
c
2
/mol dm
-3
= 0 - 1
Prepared By:
D.M. Mason
Experimental Data:
(Subscripts 1,2,3, ..., in column headings refer to components 1,2,3, ...)
t/°C
T/K
Concentration C
2
[mol/dm
3
]
Keunen coefficient, S
S Note
α
α Note
15
288.15
0
-
b
0.990
a
15
288.15
0.25
0.884
b
0.875
a
15
288.15
0.5
0.810
b
0.793
a
15
288.15
1
0.513
b
0.489
a
20
293.15
0
-
b
0.860
a
20
293.15
0.25
0.7905
b
0.782
a
20
293.15
0.5
0.720
b
0.704
a
20
293.15
1
0.438
b
0.418
a
25
298.15
0
-
b
0.758
a
25
298.15
0.25
0.700
b
0.692
a
25
298.15
0.5
0.634
b
0.619
a
25
298.15
1
0.3733
b
0.355
a
30
303.15
0
-
b
0.671
a
30
303.15
0.25
0.6218
b
0.614
a
30
303.15
0.5
0.561
b
0.547
a
30
303.15
1
0.323
b
0.307
a
35
308.15
0
-
b
0.605
a
35
308.15
0.25
0.5575
b
0.550
a
35
308.15
0.5
0.504
b
0.491
a
35
308.15
1
0.2801
b
0.266
a
40
313.15
0
-
b
0.546
a
40
313.15
0.25
0.4962
b
0.489
a
40
313.15
0.5
0.4422
b
0.431
a
40
313.15
1
0.2305
b
0.228
a
45
318.15
0
-
b
0.482
a
45
318.15
0.25
0.443
b
0.436
a
45
318.15
0.5
0.3855
b
0.385
a
45
318.15
1
0.209
b
0.198
a
50
323.15
0
-
b
0.436
a
50
323.15
0.25
0.4075
b
0.401
a
50
323.15
0.5
0.354
b
0.344
a
50
323.15
1
0.179
b
0.169
a
55
328.15
0
-
b
0.392
a
55
328.15
0.25
0.365
b
0.359
a
55
328.15
0.5
0.3218
b
0.312
a
55
328.15
1
0.1592
b
0.150
a
60
333.15
0
-
b
0.372
a
60
333.15
0.25
0.333
b
0.327
a
60
333.15
0.5
0.2925
b
0.283
a
Notes:
a
α = Bunsen coefficient [cm
3
(STP) cm
-3
atm
-1
].
b
S
= Kuenen coefficient [cm
3
(STP) g
-1
(H
2
O) atm
-1
].
Method/Apparatus/Procedure:
The principle of the Ostwald method was used in which a measured volume of gas-free liquid is stirred in the presence of the gas, and its decrease in volume is measured in a burette over mercury. The volume of liquid was measured at the experimental temperature. For calculation of the Kuenen coefficient, the density of the solution was obtained from Landolt-Börnstein extant 1969. The molar concentration of salt in the liquid was standardized at 20°C. These data are analyzed and discussed further in Ref. 1.
Source and Purity of Materials:
(1)VEB Leuna Works; 99.8 vol %; the impurity was mostly water (author).
(2) DDR pro analysis grade by DDR Standard TGL 5021.
(3) Double distilled.
Estimated Errors:
Temperature: Not given.
References:
1. Gerecke, J.; Bittrich, H.J., Wiss. Z. Tech. Hochsch. Chem. "Carl Schorlemmer" Leuna-Merseburg 1971, 13(2), 115-22.