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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Zinc formate with Water
Components:
(1) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
(2) Zinc formate; Zn(CHO2)2; [557-41-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Ashton, F.W.; Houston, D.F.; Saylor, C.P., J. Res. Nat. Bur. Stand. 11, 233-53 (1933).
Variables:
Temperature = 0 ºC to 100 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 of zinc formate in water.
t/°C
g
1
/g
2
Phase
Mass Fraction w
1
m
1
[mol kg-1]
Solid Phase(s)
a
0
3.7
Liquid
3.6
0.24
A
10
4.3
Liquid
4.1
0.27
A
20
5.2
Liquid
4.9
0.34
A
30
6.1
Liquid
5.8
0.39
A
40
7.4
Liquid
6.9
0.48
A
50
9.2
Liquid
8.4
0.59
A
60
11.8
Liquid
10.6
0.759
A
70
15.5
Liquid
13.4
0.997
A
80
21.2
Liquid
17.5
1.36
A
90
28.8
Liquid
22.4
1.85
A
100
38.0
Liquid
27.5
2.45
A
Notes:
a
The solid phase is: A = Zn(CHO
2
)
2
•2H
2
O.
Method/Apparatus/Procedure:
The isothermal method was used. Samples were taken at 6 and 18 h, filtered into weighing bottles and weighed. They were then evaporated in an oven at 125 °C, cooled in a desiccator and reweighed. From the weight of anhydrous salt the solubility in g/100g H
2
O was calculated.
Source and Purity of Materials:
Zinc formate dihydrate was recrystallized twice from formic acid solution, dried at 125 °C and stored in a desiccator. The dihydrate was again recrystallized from a 1% formic acid solution at room temperature by the addition of 95% alcohol.
Estimated Errors:
Solubility: ±0.1 g/100 g H
2
O.