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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Aluminum formate with Water
Components:
(1) Aluminum formate; Al(CHO2)3; [7360-53-4]
NIST Chemistry WebBook
for detail
(2) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Chapligina, H.M.; Babievskaya, I.Z.; Kudinov, I.B., Zh. Neorg. Khim. 29, 2206-10 (1984)
Variables:
Concentration = Composition at 25 ºC to 100 ºC
Prepared By:
Chr. Balarew and St. Trendafilova
Experimental Remarks:
The molality values were calculated by the compilers.
Note:
AlOH(CHO
2
)
2
·0.5H
2
O is totally converted to the trihydrate at 50 °C in a solution containing 25 mass % formic acid.
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility values in the Al(CHO
2
)
3
•3H
2
O-H
2
O system.
t/°C
Chemical
1
Phase
Mass Fraction w
1
m
1
[mol kg-1]
Chemical
2
Mass Fraction w
2
Solid Phase(s)
a
25
Al(CHO2)3
Liquid
6.19
0.407
Al3+
1.03
A
50
Al(CHO2)3
Liquid
7.03
0.467
Al3+
1.17
A
100
Al(CHO2)3
Liquid
-
-
Al3+
Hydrolysis
B
Solubility values of AlOH(CHO
2
)
2
•0.5H
2
O in water.
t/°C
Chemical
1
Phase
Mass Fraction w
1
m
1
[mol kg-1]
Chemical
2
Mass Fraction w
2
Solid Phase(s)
a
25
Al(CHO2)3
Liquid
3.24
0.207
Al3+
0.54
B
50
Al(CHO2)3
Liquid
3.30
0.211
Al3+
0.55
B
100
Al(CHO2)3
Liquid
1.44
0.09
Al3+
0.24
C
Notes:
a
The solid phases are: A = Al(CHO
2
)
3
•3H
2
O; B = AlOH(CHO
2
)
2
•0.5H
2
O; C = AlOH(CHO
2
)
2
.
Method/Apparatus/Procedure:
No information is given about the method used. The aluminum content was determined complexometrically by back titrating excess Trilon B with a 0.1 N Pb(NO
3
)
2
solution. Xylenol orange was the indicator. The formate ion content was determined permanganometrically or by titration with dilute NaOH.
Source and Purity of Materials:
Aluminum formate was prepared by dissolving p.a. grade AlCl
3
•6H
2
O and p.a. grade NaHCO
3
at room temperature in a minimum quantity of 10% p.a. grade formic acid. After 5-6 h a residue of Al(CHO
2
)
3
•3H
2
O is formed. It is separated by filtration and air dried. Aluminum formate was also formed by dissolving a fresh suspension of Al(OH)
3
in 30-35% p.a. grade formic acid at 60 °C, filtering and air drying.
Estimated Errors:
Solubility: No information is given.
Temperature: No information is given.