Solubility System: Iron formate with Water (Original Report)
(2) Water, H2O; [7732-18-5] NIST Chemistry WebBook
|T1 (°C)||w1||m1 (mol/kg) ($^a)||Phase (^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.