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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Manganese formate with Water
Components:
(1) Manganese formate; Mn(CHO2)2; [3251-96-5]
NIST Chemistry WebBook
for detail
(2) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Balarew, C.; Stoilova, D.G.; Vassileva, V.Z., Dokl. Bolg. Acad. Nauk 35, 933 (1982).
Variables:
Temperature = 10 ºC to 80 ºC
Prepared By:
Chr. Balarew and St. Trendafilova
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility polytherm of the Mn(CHO
2
)
2
-H
2
O system.
t/°C
Phase
Mass Fraction w
1
m
1
[mol kg-1]
a
Solid Phase(s)
b
10
Liquid phase Mn(CHO2)2
5.33
0.388
A
15
Liquid phase Mn(CHO2)2
5.96
0.437
A
20
Liquid phase Mn(CHO2)2
6.15
0.452
A
25
Liquid phase Mn(CHO2)2
6.28
0.462
A
30
Liquid phase Mn(CHO2)2
6.69
0.495
A
35
Liquid phase Mn(CHO2)2
6.97
0.517
A
40
Liquid phase Mn(CHO2)2
7.47
0.557
A
45
Liquid phase Mn(CHO2)2
7.83
0.586
A
50
Liquid phase Mn(CHO2)2
8.08
0.606
A
55
Liquid phase Mn(CHO2)2
9.09
0.690
A
60
Liquid phase Mn(CHO2)2
9.68
0.739
A
65
Liquid phase Mn(CHO2)2
9.80
0.749
A
70
Liquid phase Mn(CHO2)2
11.54
0.900
A
75
Liquid phase Mn(CHO2)2
11.75
0.918
A
80
Liquid phase Mn(CHO2)2
12.44
0.980
A
Notes:
a
These values were calculated by the compilers.
b
The solid phase is: A = Mn(CHO
2
)
2
•2H
2
O.
Method/Apparatus/Procedure:
Equilibrium was reached after about 2 days of stirring using the isothermal decrease of supersaturation method. The manganese content of the solid and liquid phases was determined complexometrically with Complexon III at
p
H 9.5-10, using Eriochrome Black T as indicator after adding hydroxylamine. The solid phases were studied microscopically and by the use of differential thermal analysis.
Source and Purity of Materials:
Manganese formate was prepared by the reaction of dilute formic acid with manganese carbonate. All reagents were p.a. grade.
Estimated Errors:
Solubility: The solubility of the salt was determined in a slight excess of formic acid (about 2%) in order to inhibit hydrolysis.