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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Copper formate with Lead formate and Water
Components:
(1) Copper formate; Cu(CHO2)2; [544-19-4]
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. 37, 2126-31 (1992).
Variables:
Concentration = Composition at 25 ºC
Prepared By:
St. Tepavitcharova and St. Trendafilova
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility values in the Cu(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
Cu(CHO2)2
Liquid
---
---
Pb(CHO2)2
2.00
0.069
A
Cu(CHO2)2
Liquid
3.16
0.215
Pb(CHO2)2
1.13
0.040
A
Cu(CHO2)2
Liquid
5.83
0.408
Pb(CHO2)2
1.10
0.040
A
Cu(CHO2)2
Liquid
6.23
0.437
Pb(CHO2)2
0.98
0.036
A
Cu(CHO2)2
Liquid
7.37
0.524
Pb(CHO2)2
1.02
0.037
A
Cu(CHO2)2
Liquid
8.04
0.575
Pb(CHO2)2
0.96
0.035
A
Cu(CHO2)2
Liquid
8.83
0.638
Pb(CHO2)2
0.99
0.037
A
Cu(CHO2)2
Liquid
9.66
0.705
Pb(CHO2)2
1.09
0.041
A
Cu(CHO2)2
Liquid
9.61
0.700
Pb(CHO2)2
1.05
0.040
A+B
Cu(CHO2)2
Liquid
9.92
0.719
Pb(CHO2)2
0.26
0.010
B
Cu(CHO2)2
Liquid
9.46
0.680
Pb(CHO2)2
---
---
B
Notes:
a
The molality values were calculated by the compilers.
b
The solid phases are: A = Pb(CHO
2
)
2
; B = Cu(CHO
2
)
2
•4H
2
O.
Method/Apparatus/Procedure:
The isothermal solubility method was used. Four weeks were allowed for equilibration. The copper content was determined iodometrically. The lead ion content was determined trilonometrically using Methylthymol Blue as indicator. Cu
2+
is masked with thiocarbamide at
p
H 5.5-6.0. The composition of the solid phase was determined by the Schreinemakers' method. X-ray diffraction, DT, TG, DTG and T analysis were also used.
Source and Purity of Materials:
The copper formate was prepared by the reaction of p.a. grade CuCO
3
with p.a. grade formic acid. The lead formate was prepared by the reaction of pure PbCO
3
with p.a. grade formic acid.
Estimated Errors:
Solubility: No information given.
Temperature: No information given.