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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Calcium formate with Lead formate and Water
Components:
(1) Nickel formate; Ni(CHO2)2; [3349-06-2]
NIST Chemistry WebBook
for detail
(2) Strontium formate; Sr(CHO2)2; [592-89-2]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Fakeev, A.A.; Akhmatova, Zh. T.; Iskhakova, L.D.; Konkova, O.B.; Zhadanov, B.V., Zh. Neorg. Khim. 41,702-704 (1996).
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 Sr(CHO
2
)
2
-Ni(CHO
2
)
2
-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
Sr(CHO2)2
Liquid
11.8
0.753
Ni(CHO2)2
0.00
0.00
A
Sr(CHO2)2
Liquid
11.6
0.740
Ni(CHO2)2
0.20
0.015
A
Sr(CHO2)2
Liquid
11.6
0.742
Ni(CHO2)2
0.50
0.038
A+B
Sr(CHO2)2
Liquid
11.6
0.742
Ni(CHO2)2
0.50
0.038
A+B
Sr(CHO2)2
Liquid
10.7
0.679
Ni(CHO2)2
0.60
0.045
B
Sr(CHO2)2
Liquid
9.0
0.561
Ni(CHO2)2
0.700
0.052
B
Sr(CHO2)2
Liquid
7.1
0.433
Ni(CHO2)2
0.700
0.051
B
Sr(CHO2)2
Liquid
5.4
0.324
Ni(CHO2)2
0.90
0.064
B
Sr(CHO2)2
Liquid
4.0
0.237
Ni(CHO2)2
1.00
0.070
B
Sr(CHO2)2
Liquid
2.4
0.139
Ni(CHO2)2
1.10
0.076
B
Sr(CHO2)2
Liquid
1.2
0.070
Ni(CHO2)2
1.40
0.097
B
Sr(CHO2)2
Liquid
0.0
0.000
Ni(CHO2)2
1.90
0.130
B
Notes:
a
The molality values were calculated by the compilers.
b
The solid phases are: A = Sr(CHO
2
)
2
•2H
2
O; B = Ni(CHO
2
)
2
.•2H
2
O.
Method/Apparatus/Procedure:
The system was studied by the isothermal solubility method. Equilibrium was reached in about 48 h. Ni
2+
was determined complexometrically at
p
H 5 using "tetra" as indicator.
1
Sr
2+
was also determined complexometrically at
p
H 10.5-11.0 using Calzein and Thymolblue as indicator. The solid phase composition was determined by the graphic method of Schreinemakers', x-ray diffraction analysis and IR spectroscopy.
Source and Purity of Materials:
The formates of strontium and nickel were prepared by dissolving strontium carbonate and basic nickel carbonate, respectively, in formic acid. The reagents used were "p.a.'' grade.
Estimated Errors:
Solubility: Not given.
Temperature: Not given.
References:
1
H. B. Tonassen and C. Chamblin. Anal. Chem.
30
, 10, 1660 (1958).