Solubility System: Iron formate with Water (Original Report)
(2) Water, H2O; [7732-18-5] NIST Chemistry WebBook
|T1 (°C)||w1||m1 (mol/kg) [Note: $^a]||Phase [Note: ^b]||Phase|
|10||3.48||0.247||A||Liquid phase Fe(CHO2)2|
|15||3.72||0.264||A||Liquid phase Fe(CHO2)2|
|20||4.05||0.289||A||Liquid phase Fe(CHO2)2|
|30||4.41||0.316||A||Liquid phase Fe(CHO2)2|
|35||4.65||0.334||A||Liquid phase Fe(CHO2)2|
|40||4.85||0.349||A||Liquid phase Fe(CHO2)2|
|45||5.08||0.362||A||Liquid phase Fe(CHO2)2|
|50||5.22||0.377||A||Liquid phase Fe(CHO2)2|
|55||5.50||0.398||A||Liquid phase Fe(CHO2)2|
|60||5.70||0.414||A||Liquid phase Fe(CHO2)2|
|65||5.89||0.429||A||Liquid phase Fe(CHO2)2|
|70||6.12||0.447||A||Liquid phase Fe(CHO2)2|
|75||6.27||0.458||A||Liquid phase Fe(CHO2)2|
|80||6.50||0.476||A||Liquid 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.
(1) Iron formate was prepared by dissolution of iron powder in dilute formic acid. All reagents were p.a. grade.
No error information given.
(1) F. A. Schreinemakers, Z. Phys. Chem. 11, 76 (1983); 55 73 (1906).