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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Potassium formate with Cadmium formate and Water
Components:
(1) Potassium formate; KCHO2; [590-29-4]
NIST Chemistry WebBook
for detail
(2) Cadmium formate; Cd(CHO2)2; [4464-23-7]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Nadzharyan, K.A.; Itkina, L.S.; Lepeshkov, I.N., Zh. Neorg. Khim. 26, 519 (1981).
Variables:
Concentration = Composition at 25 ºC
Prepared By:
Chr. Balarew and St. Trendafilova
Experimental Remarks:
The molality values were calculated by the compilers.
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility values in the KCHO
2
-Cd(CHO
2
)
2
-H
2
O system at 25 °C.
Chemical
1
Phase
Mass Fraction w
1
m
1
[mol kg-1]
Chemical
2
Mass Fraction w
2
m
2
[mol kg-1]
Solid Phase(s)
a
KCHO2
Liquid
81.82
53.51
Cd(CHO2)2
---
---
A
KCHO2
Liquid
79.16
47.42
Cd(CHO2)2
0.99
0.246
A+B
KCHO2
Liquid
76.09
39.63
Cd(CHO2)2
1.08
0.234
B
KCHO2
Liquid
70.06
29.14
Cd(CHO2)2
1.35
0.233
B
KCHO2
Liquid
62.19
21.07
Cd(CHO2)2
2.71
0.381
B
KCHO2
Liquid
60.55
19.91
Cd(CHO2)2
3.28
0.448
B
KCHO2
Liquid
58.67
18.94
Cd(CHO2)2
4.50
0.604
B
KCHO2
Liquid
57.38
18.42
Cd(CHO2)2
5.57
0.743
B
KCHO2
Liquid
56.15
17.68
Cd(CHO2)2
6.09
0.797
B
KCHO2
Liquid
51.49
16.13
Cd(CHO2)2
10.53
1.373
B+C
KCHO2
Liquid
49.59
14.62
Cd(CHO2)2
10.07
1.233
C
KCHO2
Liquid
41.86
10.37
Cd(CHO2)2
10.14
1.043
C
KCHO2
Liquid
35.54
8.054
Cd(CHO2)2
11.99
1.129
C
KCHO2
Liquid
29.88
6.540
Cd(CHO2)2
14.79
1.136
C
KCHO2
Liquid
25.24
5.503
Cd(CHO2)2
20.22
1.831
C
KCHO2
Liquid
22.14
4.923
Cd(CHO2)2
24.39
2.253
C+D
KCHO2
Liquid
20.77
4.241
Cd(CHO2)2
21.00
1.781
D
KCHO2
Liquid
18.41
3.520
Cd(CHO2)2
19.40
1.541
D
KCHO2
Liquid
12.73
2.127
Cd(CHO2)2
16.09
1.117
D
KCHO2
Liquid
-
-
Cd(CHO2)2
14.10
0.811
D
Notes:
a
The solid phases are: A = KCHO
2
; B = K
3
Cd(CHO
2
)
5
; C = KCd(CHO
2
)
3
; D = Cd(CHO
2
)
2
•2H
2
O.
Method/Apparatus/Procedure:
The isothermal method was used. The mixtures were placed in glass vessels in a thermostat and stirred mechanically. Equilibrium was reached in 3 weeks. The potassium content of both phases was determined by the tetraphenylborate method. The cadmium content was determined complexometrically. The composition of the solid phases was determined by Schreinemakers' method.
Source and Purity of Materials:
KCHO
2
was prepared by neutralizing 85% formic acid with p.a. grade KOH. Cadmium formate was obtained from p.a. grade cadmium carbonate.
Estimated Errors:
Temperature: The temperature was kept constant to within ±0.1 °C.