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Solubility System: Carbon dioxide with Potassium dihydrogen phosphate and Water (Original Report)

Components:
(1) Carbon dioxide, CO2; [124-38-9] NIST Chemistry WebBook
(2) Potassium dihydrogenphosphate, KH2PO4; [7778-77-0] NIST Chemistry WebBook
(3) Water, H2O; [7732-18-5] NIST Chemistry WebBook
Original Measurements
Gerecke, J. ; Diss. Dr. rer. Nat. 1969, Hochsch. "Carl Schorlemmer", Leuna-Merseburg, DDR.

Variables:
Temperature: 288.15 K - 333.15 K
Pressure: 101.325 kPa
Concentration: c2/mol dm-3 = 0 - 1
Prepared By:
D.M. Mason
Experimental Data:
T (K)T (°C)c2 (mol/dm3)α [Note: a]S [Note: b]
288.151500.99-
288.15150.250.8750.884
288.15150.50.7930.81
288.151510.4890.513
293.152000.86-
293.15200.250.7820.7905
293.15200.50.7040.72
293.152010.4180.438
298.152500.758-
298.15250.250.6920.7
298.15250.50.6190.634
298.152510.3550.3733
303.153000.671-
303.15300.250.6140.6218
303.15300.50.5470.561
303.153010.3070.323
308.153500.605-
308.15350.250.550.5575
308.15350.50.4910.504
308.153510.2660.2801
313.154000.546-
313.15400.250.4890.4962
313.15400.50.4310.4422
313.154010.2280.2305
318.154500.482-
318.15450.250.4360.443
318.15450.50.3850.3855
318.154510.1980.209
323.155000.436-
323.15500.250.4010.4075
323.15500.50.3440.354
323.155010.1690.179
328.155500.392-
328.15550.250.3590.365
328.15550.50.3120.3218
328.155510.150.1592
333.156000.372-
333.15600.250.3270.333
333.15600.50.2830.2925

a) α = Bunsen coefficient [cm3 (STP) cm-3 atm-1].
b) S= Kuenen coefficient [cm3 (STP) g-1(H2O) 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.

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