Solubility System: Iron formate with Water (Original Report)

(1) Iron(II) formate, Fe(CHO2)2; [3047-59-4] NIST Chemistry WebBook
(2) Water, H2O; [7732-18-5] NIST Chemistry WebBook
Original Measurements
Vasileva, V.; Karapetkova, A.; Bulgarian Chemical Communications 28, 151-9 (1995).
Temperature: 10°C - 80°C
Experimental Data:
Table 1
T1 (°C)w1 m1 (mol/kg) ($^a)Phase (^b)Phase
103.480.247ALiquid phase Fe(CHO2)2
153.720.264ALiquid phase Fe(CHO2)2
204.050.289ALiquid phase Fe(CHO2)2
304.410.316ALiquid phase Fe(CHO2)2
354.650.334ALiquid phase Fe(CHO2)2
404.850.349ALiquid phase Fe(CHO2)2
455.080.362ALiquid phase Fe(CHO2)2
505.220.377ALiquid phase Fe(CHO2)2
555.500.398ALiquid phase Fe(CHO2)2
605.700.414ALiquid phase Fe(CHO2)2
655.890.429ALiquid phase Fe(CHO2)2
706.120.447ALiquid phase Fe(CHO2)2
756.270.458ALiquid phase Fe(CHO2)2
806.500.476ALiquid phase Fe(CHO2)2

a) These values were calculated by the compilers.
b) The solid phase is: A = Fe(CHO2)2·2H2O.


The isothermal solubility method was used. Equilibrium was reached in 5-7 hrs. in an argon atmosphere. Fe2+ was first oxidized to Fe3+ with H2O2 and then determined complexometrically at pH 1.5 and sulfosalicylic acid as indicator. The solid phase composition was determined by the graphic method of Schreinemakers for wet residues.1 X-ray diffraction analysis was also used.

Source and Purity of Materials:

(1) Iron formate was prepared by dissolution of iron powder in dilute formic acid. All reagents were p.a. grade.

Estimated Errors

No error information given.


(1) F. A. Schreinemakers, Z. Phys. Chem. 11, 76 (1983); 55 73 (1906).

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