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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Barium formate with Lead formate and Water
Components:
(1) Barium formate; Ba(CHO2)2; [541-43-5]
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:
Fock, A., Z. Kristallogr. u Mineralogie 28, 337-413 (1897).
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 Ba(CHO
2
)
2
-Pb(CHO
2
)
2
-H
2
O system at 25 °C.
Chemical
1
Phase
Mass Fraction w
1
a
m
1
[mol kg-1]
Solubility
1
[mol/L]
Chemical
2
Mass Fraction w
2
a
m
2
[mol kg-1]
Solubility
2
[mol/L]
Solid Phase(s)
b
ρ
Distribution Coefficient
Ba2+/Pb2+
Pb(CHO2)2
Liquid
0.0
0.0
0.0
Ba(CHO2)2
23.42
1.345
1255
A
1.2204
---
Pb(CHO2)2
Liquid
0.09
0.004
3.72
Ba(CHO2)2
23.42
1.346
1260
B
1.2213
0.17
Pb(CHO2)2
Liquid
0.23
0.010
9.44
Ba(CHO2)2
23.65
1.366
1274
B
1.2251
0.13
Pb(CHO2)2
Liquid
0.42
0.019
17.88
Ba(CHO2)2
25.69
1.529
1418
B
1.2529
0.09
Pb(CHO2)2
Liquid
0.93
0.041
38.49
Ba(CHO2)2
23.65
1.379
1286
B
1.2341
0.09
Pb(CHO2)2
Liquid
1.87
0.083
77.83
Ba(CHO2)2
22.74
1.326
1237
B
1.2355
0.05
Pb(CHO2)2
Liquid
2.50
0.090
95.50
Ba(CHO2)2
0.0
0.0
0.0
C
1.0911
---
Notes:
a
These values, and the molalities, were calculated by the compilers.
b
The solid phase are: A = Ba(CHO
2
)
2
; B = (Pb,Ba)(CHO
2
)
2
; C = Pb(CHO
2
)
2
.
Method/Apparatus/Procedure:
A saturated solution of one component was prepared at 25 °C. Then the second component was added while the mixture was heated. After cooling to 25 °C the crystals were removed, crushed and again added to the mixture, which was then stirred for 4 h. Samples were then removed for analysis. The lead was determined gravimetrically as PbS.
Source and Purity of Materials:
Commercially available substances were used.
Estimated Errors:
Temperature: Not given.