IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Aluminum formate with Water

   (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)


   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(CHO2)2·0.5H2O 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(CHO2)3•3H2O-H2O system.
t/°CChemical1PhaseMass Fraction w1m1 [mol kg-1]Chemical2Mass Fraction w2Solid Phase(s)a
100Al(CHO2)3Liquid --Al3+HydrolysisB
Solubility values of AlOH(CHO2)2•0.5H2O in water.
t/°CChemical1PhaseMass Fraction w1m1 [mol kg-1]Chemical2Mass Fraction w2Solid Phase(s)a
   a  The solid phases are: A = Al(CHO2)3•3H2O; B = AlOH(CHO2)2•0.5H2O; C = AlOH(CHO2)2.

   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(NO3)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 AlCl3•6H2O and p.a. grade NaHCO3 at room temperature in a minimum quantity of 10% p.a. grade formic acid. After 5-6 h a residue of Al(CHO2)3•3H2O 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.