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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Cobalt formate with Yttrium formate and 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
(3) Yttrium formate; Y(CHO2)3; [15331-71-2]
NIST Chemistry WebBook
for detail
Original Measurements:
Portnova, S.M.; Krassilov, Yu. I.; Kuznetzov, N.T.; Balakaeva, I.V., Zh. Neorg. Khim. 35, 237-41 (1990).
Variables:
Concentration = Composition at 25 ºC
Prepared By:
Chr. Balarew and St. Trendafilova
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility values in the Co(CHO
2
)
2
-Y(CHO
2
)
3
-H
2
O system at 25 °C.
Chemical
1
Phase
Mass Fraction w
1
m
1
[mol kg-1]
a
Chemical
2
Mass Fraction w
2
m
2
[mol kg-1]
a
Solid Phase(s)
b
Co(CHO2)2
Liquid
2.42
0.166
Y(CHO2)3
---
---
A
Co(CHO2)2
Liquid
1.53
0.108
Y(CHO2)3
3.58
0.168
A
Co(CHO2)2
Liquid
1.13
0.084
Y(CHO2)3
8.65
0.428
A
Co(CHO2)2
Liquid
0.86
0.064
Y(CHO2)3
9.19
0.456
A
Co(CHO2)2
Liquid
0.65
0.052
Y(CHO2)3
15.74
0.841
A
Co(CHO2)2
Liquid
0.67
0.057
Y(CHO2)3
19.98
1.124
A+B
Co(CHO2)2
Liquid
0.53
0.045
Y(CHO2)3
20.14
1.134
B
Co(CHO2)2
Liquid
---
---
Y(CHO2)3
21.41
1.216
B
Notes:
a
The molality values were calculated by the compilers.
b
The solid phases are: A = Co(CHO
2
)
2
•2H
2
O; B = Y(CHO
2
)
3
•2H
2
O.
Method/Apparatus/Procedure:
The isothermal method was used. One month was allowed for equilibration. The Y
3+
and Co
2+
contents were determined complexometrically using diethyldithiocarbamate.
1
The composition of the solid phases was determined by the Schreinemakers method.
Source and Purity of Materials:
The formates were obtained by neutralizing dilute formic acid with p.a. grade Y(OH)
3
and basic cobalt carbonate.
Estimated Errors:
Solubility: No information given.
Temperature: No information given.
References:
1
J. S. Fritz, R. T. Oliver, and D. L. Pietryc, Anal.Chem.
30
, 1111 (1958).