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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Potassium formate with Manganese formate and Water
Components:
(1) Potassium formate; KCHO2; [590-29-4]
NIST Chemistry WebBook
for detail
(2) Manganese formate; Mn(CHO2)2; [3251-96-5]
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. 39,163-168 (1994).
Variables:
Concentration = Composition at 25 ºC
Prepared By:
Chr. Balarew and St. Trendafilova
Experimental Remarks:
The molality values were calculated by the compilers.
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility values in the KCHO
2
-Mn(CHO
2
)
2
-H
2
O system at 25 °C.
Chemical
1
Phase
Mass Fraction w
1
m
1
[mol kg-1]
Chemical
2
Mass Fraction w
2
m
2
[mol kg-1]
Solid Phase(s)
a
Mn(CHO2)2
Liquid
6.94
0.89
KCHO2
---
---
A
Mn(CHO2)2
Liquid
2.89
0.41
KCHO2
12.29
1.00
A
Mn(CHO2)2
Liquid
2.66
0.40
KCHO2
18.16
1.58
A
Mn(CHO2)2
Liquid
2.76
0.43
KCHO2
21.26
1.93
A
Mn(CHO2)2
Liquid
3.14
0.53
KCHO2
25.80
2.50
A
Mn(CHO2)2
Liquid
3.45
0.60
KCHO2
28.22
2.85
A+B
Mn(CHO2)2
Liquid
3.32
0.58
KCHO2
28.30
2.86
B
Mn(CHO2)2
Liquid
1.98
0.37
KCHO2
33.78
3.63
B
Mn(CHO2)2
Liquid
1.43
0.28
KCHO2
38.46
4.41
B
Mn(CHO2)2
Liquid
1.05
0.23
KCHO2
44.36
5.61
B
Mn(CHO2)2
Liquid
0.88
0.21
KCHO2
48.96
6.73
B
Mn(CHO2)2
Liquid
0.84
0.22
KCHO2
52.88
7.88
B
Mn(CHO2)2
Liquid
0.81
0.22
KCHO2
55.02
8.59
B
Mn(CHO2)2
Liquid
0.78
0.22
KCHO2
57.50
9.51
B
Mn(CHO2)2
Liquid
0.77
0.24
KCHO2
61.16
11.08
B
Mn(CHO2)2
Liquid
0.77
0.28
KCHO2
67.08
14.40
B
Mn(CHO2)2
Liquid
0.79
0.32
KCHO2
70.20
16.70
B+C
Mn(CHO2)2
Liquid
0.02
0.01
KCHO2
77.95
24.41
C
Mn(CHO2)2
Liquid
0.02
0.01
KCHO2
80.29
28.13
C
Mn(CHO2)2
Liquid
0.02
0.01
KCHO2
80.50
28.51
C
Mn(CHO2)2
Liquid
---
---
KCHO2
81.82
31.05
C
Notes:
a
The solid phases are: A = Mn(CHO
2
)
2
, B = KMn(CHO
2
)
3
, C = KCHO
2
.
Method/Apparatus/Procedure:
The isothermal solubility method was used. Four weeks were allowed for attainment of the equilibrium at a constant temperature. The composition of the liquid and wet solid phases were determined as follows:The K
+
content was determined gravimetrically by the tetraphenylborate method. Mn
2+
was determined complexometrically in basic medium, in the presence of 10% solution of NH
2
OH•HCl using Eriochrome Black T as indicator. The composition of the solid phases was determined by elemental analysis, thermogravimetrically, crystallooptically and by X-ray diffraction. The composition of the suction dried solid phase was determined by the Schreinemakers' method also.
Source and Purity of Materials:
KCHO
2
was obtained from KOH and H
2
CO
2
p.a. grade.
1
Mn(CHO
2
)
2
was obtained from Mn(CHO
2
)
2
•2H
2
O 'pure' grade through recrystallization (double recrystallization).
Estimated Errors:
References:
1
L. S. Itkina, N. M. Chaplygina, and E. V. Petrova, Zh. Neorg. Khim.
24
, 788 (1979).