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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Potassium formate with Nickel formate and Water
Components:
(1) Potassium formate; KCHO2; [590-29-4]
NIST Chemistry WebBook
for detail
(2) Nickel formate; Ni(CHO2)2; [3349-06-2]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Portnova, S.M.; Lyashchenko, A.K.; Borina, A.F.; Vassileva, V.; Akhmatova, J.T.; Petrova, E.V., Zh. Neorg. Khim. 31, 1068-74 (1986).
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
-Ni(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
---
---
Ni(CHO2)2
2.13
0.146
A
KCHO2
Liquid
1.75
0.214
Ni(CHO2)2
1.14
0.079
A
KCHO2
Liquid
5.04
0.636
Ni(CHO2)2
0.73
0.052
A
KCHO2
Liquid
9.30
1.23
Ni(CHO2)2
0.48
0.036
A
KCHO2
Liquid
19.66
2.927
Ni(CHO2)2
0.46
0.039
A
KCHO2
Liquid
26.41
4.297
Ni(CHO2)2
0.51
0.047
A
KCHO2
Liquid
28.45
4.765
Ni(CHO2)2
0.56
0.053
A
KCHO2
Liquid
34.33
6.280
Ni(CHO2)2
0.67
0.069
A
KCHO2
Liquid
34.62
6.385
Ni(CHO2)2
0.91
0.095
A
KCHO2
Liquid
39.76
8.032
Ni(CHO2)2
1.38
0.158
A+B
KCHO2
Liquid
42.37
8.914
Ni(CHO2)2
1.11
0.132
B
KCHO2
Liquid
48.19
11.23
Ni(CHO2)2
0.79
0.104
B
KCHO2
Liquid
50.83
12.63
Ni(CHO2)2
1.31
0.184
B
KCHO2
Liquid
56.79
16.12
Ni(CHO2)2
1.32
0.212
B
KCHO2
Liquid
58.25
17.10
Ni(CHO2)2
1.24
0.206
B
KCHO2
Liquid
61.04
19.29
Ni(CHO2)2
1.34
0.239
B
KCHO2
Liquid
63.98
21.99
Ni(CHO2)2
1.43
0.278
B
KCHO2
Liquid
65.57
23.68
Ni(CHO2)2
1.51
0.308
B+C
KCHO2
Liquid
66.81
25.01
Ni(CHO2)2
1.43
0.303
C
KCHO2
Liquid
70.09
29.05
Ni(CHO2)2
1.22
0.286
C
KCHO2
Liquid
70.35
28.28
Ni(CHO2)2
0.07
0.016
C
KCHO2
Liquid
72.72
31.78
Ni(CHO2)2
0.07
0.017
C
KCHO2
Liquid
75.59
37.00
Ni(CHO2)2
0.12
0.033
C
KCHO2
Liquid
78.00
42.25
Ni(CHO2)2
0.05
0.015
C
KCHO2
Liquid
77.78
41.74
Ni(CHO2)2
0.06
0.018
C+D
KCHO2
Liquid
81.82
53.51
Ni(CHO2)2
---
---
D
Notes:
a
The solid phases are: A = Ni(CHO
2
)
2
•2H
2
O; B = 2KCHO
2
•3Ni(CHO
2
)
2
•H
2
O; C = KCHO
2
•Ni(CHO
2
)
2
; D = KCHO
2
.
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 4 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. The crystals were washed with ethanol and dried over sulfuric acid. Merck Ni(CHO
2
)
2
•2H
2
O was used.
Estimated Errors: