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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Cobalt formate with Water
Components:
(1) Cobalt formate; Co(CHO2)2; [544-18-3]
NIST Chemistry WebBook
for detail
(2) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Stoilova, D.; Balarew, C.; Vassileva, V., St. Russeva, Zh. Neorg. Khim. 26, 1641 (1981).
Variables:
Temperature = 10 ºC to 80 ºC
Prepared By:
Chr.Balarew and St. Trendafilova
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility polytherm of the Co(CHO
2
)
2
-H
2
O system.
t/°C
Phase
Mass Fraction w
1
m
1
[mol kg-1]
a
Solid Phase(s)
b
10
Liquid
2.03
0.139
A
15
Liquid
2.18
0.150
A
20
Liquid
2.34
0.161
A
25
Liquid
2.44
0.168
A
30
Liquid
2.55
0.176
A
35
Liquid
2.69
0.186
A
40
Liquid
2.85
0.197
A
45
Liquid
3.05
0.211
A
50
Liquid
3.33
0.231
A
55
Liquid
3.41
0.237
A
60
Liquid
3.59
0.250
A
65
Liquid
3.79
0.264
A
70
Liquid
4.02
0.281
A
75
Liquid
4.19
0.294
A
80
Liquid
4.28
0.300
A
Notes:
a
These values were calculated by the compilers.
b
The solid phase is: A = Co(CHO
2
)
2
•2H
2
O.
Method/Apparatus/Procedure:
The decrease of supersaturation was studied isothermally in about a 2% excess of formic acid to suppress hydrolysis of the salt. Equilibrium was reached in 15-20 h. The cobalt concentration was determined using Complexone III at
p
H 5.5-6 with Xylenol orange as indicator. The composition of the solid phase was determined by x-ray diffraction and chemical analysis.
Source and Purity of Materials:
Cobalt formate was prepared by neutralizing basic cobalt carbonate with dilute formic acid.
Estimated Errors: