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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Calcium formate with Copper(II) formate and Water
Components:
(1) Calcium formate; Ca(CHO2)2; [544-17-2]
NIST Chemistry WebBook
for detail
(2) Lead formate; Pb(CHO2)2; [811-54-1]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Portnova, S.M.; Palitskaya, T.A., Zh. Neorg. Khim. 34, 204-9 (1989).
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 Ca(CHO
2
)
2
-Pb(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
Ca(CHO2)2
Liquid
0.0
0.0
Pb(CHO2)2
2.00
0.07
A
Ca(CHO2)2
Liquid
2.32
0.18
Pb(CHO2)2
0.79
0.03
A
Ca(CHO2)2
Liquid
3.99
0.32
Pb(CHO2)2
0.74
0.03
A
Ca(CHO2)2
Liquid
8.01
0.67
Pb(CHO2)2
0.79
0.03
A
Ca(CHO2)2
Liquid
13.70
1.24
Pb(CHO2)2
1.30
0.05
A + B
Ca(CHO2)2
Liquid
14.07
1.28
Pb(CHO2)2
1.42
0.06
B
Ca(CHO2)2
Liquid
14.10
1.28
Pb(CHO2)2
1.22
0.05
B
Ca(CHO2)2
Liquid
14.56
1.33
Pb(CHO2)2
1.03
0.04
B
Ca(CHO2)2
Liquid
14.43
1.30
Pb(CHO2)2
0.0
0.0
B
Notes:
a
The molality values were calculated by the compilers.
b
The solid phases are: A = Pb(CHO
2
)
2
; B = Ca(CHO
2
)
2
.
Method/Apparatus/Procedure:
The isothermal method was used. Four weeks were allowed for equilibration. The Ca
2+
content was determined complexometrically in a basic medium using Methylthymolblue as indicator. The Pb
2+
content was determined trilonometrically. The composition of the solid phases was determined by the Schreinemakers' method, IR spectroscopy, DTA, and X-ray diffraction.
Source and Purity of Materials:
The formates were obtained by neutralizing formic acid with p. grade calcium hydroxide and p. grade PbCO
3
.
Estimated Errors:
Temperature: No information is given.